Super interesting premise, though the misunderstanding of the Bible is so hilariously wrong, I guess it's fitting for the setting.
Like, eating animals and sex by themselves never were understood to be sins (unless we're talking about the heretical Gnostics), only there was a mosaic law against eating unclean animals because disease was such a huge issue. Likewise sexual promiscuity promulgates disease AND destroys the foundation of civilization which is the family unit.
Homosexuals aren't damned for how they are born, anyone who rejects God goes to Hell, and God calls our active sexuality to align with morality and nature.
The lie of the serpent in the Garden of Eden wasn't "if you eat of it you will be like God" but "If you eat it you will not die". The truth to God's commandment was spiritual death, not physical death. Never did God say that he would never give them the fruit of the Knowledge of Good and Evil, only not to eat it at that time. The moral of the story is about disobedience when you don't understand why, as every little kid knows.
God IS the will to live. He is existence itself.
Edit: My mistake for not reading the synopsis. Says it's based upon Gnostic beliefs, not Christian beliefs. They believed material reality was evil so only spiritual things were good, and so all actions to live- eating, reproducing- were "necessary" sins. There's a reason they became the epitome of what we imagine a Cult being here in the west.