Actually, as a Christian, I don't think that the existence of God is a fact. I try to live my life on the premise that God exists (partly because I find it harder to believe that God does not exist), but God has not revealed himself (or herself if you prefer) to me in an unambiguous way so I can't claim the existence of God as a fact even from my perspective, let alone as a universally proven fact. I therefore respect your right not to affirm my faith; you do not have to say "Amen" to my prayers, and actually I think it would be very insensitive even to pray openly in your presence. The very furthest I might go is to offer you the choice, but much more likely I would respect your worldview enough to leave it entirely up to you to engage with my faith or not to engage with it.
I do not accept the claims of genderism at all, and I don't think it's OK for genderists, whether of the ultra conservative or the TRA variety, to impose their sexist stereotypes on those of us who don't accept the validity of gender stereotypes. So the assumption that everyone should accept the concept of gender identity as useful is as unreasonable as the assumption that everyone, no matter their personal experiences, should be a believer in God.