I am wary of your T's answer because:

1: You JUST told her that you think you might be a lesbian
and
2. It seems her Christian beliefs are a part of her therapy , not just her belief system outside the office

I tend to want to call BS on her remarks.

Only you know your orientation…I can't imagine a T trying to say I'm straight because my early abuser was female. I'm heterosexual because I just am.

Just stay aware of your inner voice telling you if this is the right T or not for you.