Try to quote the Bible as much as possible. Jesus wants you to be happy

Do you know their stance on lgbtq? And if it is negative are you attempting to change it?

they are supportive of lgbtq, and i hope that hasnt changed since we went to a new church after a decade of not going

Alright, good. Now just in case you can look up pro trans arguments from Christians if you want.
May I ask you which trans you are coming out as?

transfem

you have a trans freind ad you want to know how your parents feel abount trans people. later (if ever) revile that you have no freinds and that freind you were mentioning was yourself. you may get a laugh out of them.
or tell them in pubic what are they going to do publicay embarrase themself by telling you off?

typing is hard. spelling is harder

Don't be. Tell them because if they truely believe in god, the will understand every body will have their own ways and everybody is different. God made evrybody the same,