I probably don't have much righ to say so... but that sounds normal. It shows she is concerned - even if to the point of not wanting to help you with what in her mind is wrong. She wants you to be happy, but can't be supportive, at least not now.
It seems like she's trying to deter your from transitioning by making a situation that is difficult if you do, and easy if you don't. I'm guessing that the idea of you transitioning threatens her in a way, because parents often see the transition as the death of their child, and the birth of someone new, and someone they don't know. Even if you know that you will still be you.
The religious part isn't really important... She wants it to be possible for you to not want to transition, so she is probably bringing up Christ to create a scenario for herself where you don't transition. If you have made your wishes to transition clear, then she probably just wants to have some hope that you will remain male. (Even four years after coming out to my own mom, she still hopes I'll not transition.)
I liked that she said...
"We love you son, I don't know if you know that or not, but we do. I will never turn my back on you no matter what road that you choose ahead for yourself."
It means that, just maybe, she can be accepting one day. I'm not sure about be an active support, but as long as she loves you, there's hope that she can be accepting someday.
To me, it just looks like she doesn't fully understand what being "transgendered" means. But, because she offered her own sources of information, and why she has her own point of view, I think that she may be open to learning. Perhaps not willingly, at least not yet, but learning is possible, so there's also hope there. Some people choose not to learn... and are very stubborn about that.
I sort of understand where she's coming from. It's definitely not a favourable reaction, but I think it's a lot better than a worst-case scenario. When I told my mom, my worst-case scenario was being disowned. She loves you... she's just afraid for you, and protective over you. That sounds like most moms.
If you're turning nineteen, well, it's probably time for you to move on from the family anyway. I would hope that you don't dislike your parents, but if you need to transition, then that should be one of the high priorities, and if moving out and going to work/school (even as male) will help your transition, then you should probably do that, if it's not too bold of me to say.
I wish you the best... and I hope that your parents will understand someday. For now, though, you just have to do what's best for you...
Be well