I'm glad there's some good news in there!
The bright side is that your father is still communicating with you, so he clearly doesn't want you to leave and never be a part of his life. Give him time.
And as for your sister - wow, what a great girl she is. With luck, she'll stick by your side through all of this, and she might also be a good conduit between you and your father. She'll set him straight, I'm sure.
I'd say all in all, your coming out was pretty successful! Not perfect, but they rarely are. Keep up the communication, break your father in gently, and I'm sure all of this will be long in the past before you know it.
And kudos for being so brave! I'm jealous . . . my folks still don't know . . .