Its not 'part of the very foundation of the Christian Religion'. The Christian religion's foundation, is to show the ferocity, yet compassion of God, and why you should love him.

The problem becomes, when a person is inspired by the Bible, wants to love, and be with God, but finds himself with a 'sin' that is out of a person's control.

Sins outlined in the Bible are things you can control:
Don't Kill
Don't Steal
Don't worship another as you would god.

But, don't be gay, is something you can't control.