I wasn't sure if this belonged in "coming out", "christianity", or "sexuality", but given that I need to approach this as trying to make two
Christian parents understand, I felt it belonged the most here. Forgive me if I'm wrong.
I have a sort of hierarchy in my head of things that my parents don't know about me that they should probably know, in order from "maybe they'll understand this" to "I am literally taking this to my grave"... and sexuality is higher on my list than gender is, because I feel like they'd understand that more readily (and I know more about my sexuality than I do my gender), but I haven't come out to them about ANYTHING yet. So far, all they know is that I am their straight Christian daughter (although I wouldn't be surprised if they had some kind of suspicion that
something is going on) who is dating a cisgender man, is pretty open about my support of LGBT* rights, and is studying to become a counselor in gay affirmative gender identity therapy. But here's what they don't know.
I am gender questioning, religious questioning, and DEFINITELY not straight. In fact, all I'd really need is to have a serious crush on or be romantically involved with someone who is intersex and/or a lot of people at different places in the non-binary range and I will have covered the entire spectrum from actual personal experience, and I know that that is very much a possibility with me and would only really take the right person to click with me on a personality level. So, I feel "pansexual" fits me best, because "bisexual" doesn't even
begin to cover this mess.

As far as religion goes, I was raised Christian my whole life (christian family, private christian school, church every sunday and wednesday and holiday, the works) so that's not completely going away ever, but I have some problems and doubts with certain popular christian doctrine and beliefs that I don't think my parents would appreciate. My beliefs basically go, I choose to believe that we are being protected by a loving God (who transcends gender; weaning myself off of "He") who accepts people into heaven based off of their actual life rather than whether or not they said some empty promise and got dunked in water, and that whether or not Jesus was a real person or a myth or the actual son of God, he is one of the best role models of all time (up there with Gandhi if not passing him a bit) that I choose to follow the teachings of. You can see how they probably won't appreciate that too much.
And here's more things they don't know: my boyfriend, whom I am dating casually due to the fact that he is eventually moving to germany and I am not (which makes our relationship temporary and we went into it knowing this; and my parents actually know that much), is actually trans (this is the only thing that I am 100% certain I will never tell them no matter what because he is stealth and it should be obvious why that will never be discussed or even so much as hinted at ever). Not only that, but he's actually not the only one... as of March, I am (consensually accepted and even encouraged by all parties involved) also dating a transwoman, who is open about her gender but not presenting as female at ALL, to the point where my parents are currently convinced that she is (not only just a friend to me, but also) a cisgender man. I have reconciled casually dating two people at once with my spirituality in that I am very open and therefore not cheating on either of them, and doing so casually rather than seriously (but casual in a serious way if that makes sense?) because right now I am looking to grow and find myself and others from a variety of relationships (platonic and romantic) rather than looking for a permanent life partner (and they both know and accept this). If ever the time came that I thought I'd learned as much as I was going to from my exploratory romantic life and would need to start looking to settle down permanently, I would part ways peacefully with my boyfriend (as we agreed would eventually happen from the beginning) and, if we were still dating, see if my girlfriend and I would work in the long haul, and move on (to only one person at a time) if we wouldn't.
TL;DR: I am a pansexual genderqueer/questioning and somewhat religious questioning individual who is dating a man and a woman at the same time and has Christian parents who know basically none of this aside from my boyfriend, and don't even know that the woman I am dating is, in fact, a woman (yet; I've been given permission from her to tell them whenever I feel like they could handle it).
I am just really lost on how to even start with any of this with them, or even WHERE to start. I have kind of compiled a list in my head, from possibly first to possibly last:
"Hey guys, my friend's name is actually Tera and if you could use female pronouns for her that'd be gr8. Yes I know she dresses like a guy all the time right now but she has her reasons and you should still respect her gender." (hoo boy, that's going to be a long conversation... they've only ever known one of my friends to be trans and had a pretty hard time accepting that, and I'm not even sure if they actually DID accept him; they just don't talk about things a lot openly so I can never be sure?)
"Guess who's kinda gaaaaaaaaaaaaaaay! Hint: She has two thumbs and is actually bisexual" (I'm not looking forward to this one either)
"Actually scratch that, I am technically pansexual. And that means..." (I feel like this would be easier for them to take seriously if I presented as bisexual to them for a little bit beforehand, long enough for them to accept that, but I also feel like maybe I should just tell them I'm pansexual and explain it from the get-go?)
"So I've been thinking about this whole Popular Views of Christianity thing..." (Yes, I actually put this lower than sexuality on the list. That's how much I'm not looking forward to explaining that my views may not completely match theirs, even if they still match more than they would if I were, say, Wiccan... which I have considered before.)
From that point on, I don't actually know if I'll ever tell them anything else, unless I split with my boyfriend in which I have resolved to immediately tell my parents about my girlfriend (after they know it's actually possible for me to HAVE a girlfriend, and pretending that I just started dating her). My gender.... I don't even know how to touch that one. I'm thinking maybe it's because I don't know that much about it myself yet, and by the time all of this other stuff is out to them I'll be a bit more comfortable in myself and know myself more and have a clearer picture of how I want my gender to play into my life, and then maybe I will know how to approach coming out to them about my gender.
But I'm wondering, even if I have a small idea of how to tell them about the first couple things, how am I actually going to go about explaining to my Christian parents that not only am I supportive of LGBT* rights, but I am actually a member of the community? My mom seems more accepting than my dad so I will probably go to her first, but I'm worried that if I addressed them separately she'd just go to my dad before I could. On the OTHER hand, if I addressed them together, they might rely on each other and double-team me. Should I tell them in person? Should I email them? Should I write them a letter? Should I wait until I'm studying abroad in Canada next semester and won't see them again until December? Should I definitely, whatever I do, NOT do that? Should I address each issue separately or get it out all at once like ripping off a bandaid (and if I did, would they actually take me seriously or would it be too much at once for them to take seriously)? Should I even TRY to explain (firstly that I am, and secondly) why I'm dating two people at once, or bring up my gender issues? I can't decide how much is too much, or what would be the best approach at all... And given that they still think homosexuality is wrong, sources which explain academically the context of related bible passages would be extremely helpful. As Christians, what do you guys think? If you were a Christian who believed that the standard things mainstream Christians disapprove of are wrong, and had a recently-20 year old child who secretly was dealing with all of these things, what would probably be the best way for them to approach you about it?