Welcome
Choosing to live by a code of standards of morality has little to do with being a Christian. Many atheists and agnostics live by a rigid set of personal standards, I include myself in that. I subscribe to a Buddhist ethic of morality...do no harm, right speech, right effort, right attitude, a believe I am a much more moral person than when I was an active Witness. Maybe because I am not enveloped by a sense of guilt like I was.
As for morality as it pertains to sexual orientation, its none of my business what other people do. I am not their judge. If there is a higher power that will judge them, than he is partly to blame for endowing them with hormones that fire differently than yours and mine. One question, are you attracted more to blondes than brunettes or vice-versa? Why is that? If you can explain to me the chemical reactions that move you to be attracted to a set of physical characteristics more than another, than maybe you can explain why some people are attracted to the same sex....
If there is a God, he is responsible for it all.