As many homosexual men and women, as well as those who are transsexual, bisexual, have relations with animals and plants, it is entirely possible, even likely that many of them maintain a personal belief in God. They may even form a devout connection to their divine gods, though it may not necessarily involve the same acceptance or repugnance you feel at learning of such lifestyles.
How one conducts himself/herself in life would therefore follow some kind of path to salvation, whether it be an Abrahamic God, Hindu pantheon, Buddhist spirit, etc. It would follow for those believers who are not living gods, that the rules were designed by others and we can not rewrite them to suit our own subject experience of judgment of ourselves. Being good and chaste and procreating as we are told the god(s) of our faith want can and will clash against what many consider to be impure, disgusting, abominable and a sin against nature. While we hope and expect we have kind and merciless deities to at least partially absolve us when mental derangement is a mitigating factor, what is the effect upon our immortal souls and/or spiritual afterlife when we consciously make deviant choices that are offensive to the faiths?
He's with the angels now?
Please know that what one religion may consider foul and sin-worthy can be quite different than what another may consider tolerable. I am not looking for any rants explaining why one religion's worldview is superior to all others, or how unreasonable or immoral you may personally consider the habits of heathens to be. It's always complicated. Myself, I believe this is a question left up to God to judge who shall be rewarded with bliss and who is damned. To pass judgment on others for what happens in the afterlife, is to speak for God, and is a sin. But we can of course keep asking questions and try to live well, free from chaos.
Is it a sin to deny the sexual act that perpetuates the species, and instead live a life where sexual hedonism is openly embraced for pure enjoyment? And to what extent are the machinations of demons (if you believe in their influence) to be blamed or mitigated against?