[In response to: No, I'm fairly open about it. My priest definitely knows, because I dated his daughter for a while. The parish in general is actually quite supportive.

But, back to: Offer me proof that as a lesbian, I must be an atheist]

Then I'm afraid to say the only logical conclusion is that your priest is a heathen himself. He is obviously uneducated in matters involving the Bible.

(the priest in question has a doctorate in Christian Theology)