@Gvarda Because Christianity is already pretty clear on those questions.
John 14:6: “I am the way, the truth, and the life. No one comes to the Father except through Me.”
Leviticus 20:13: “If a man lies with a male as with a woman, both of them have committed an abomination; they shall surely be put to death; their blood is upon them.”
(And in case you point out that the second quote is from the Old Testament and not Jesus himself – Matthew 5:17: “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.”)

Btw, I personally find it rather amusing how some people today try to reconcile their modern liberal values with the clearly irreconcilable ancient Abrahamic morals. Gay Christians and, even more so, gay Muslims – at first it sounds like an oxymoron, but then it actually shows how flexible our “staunch” beliefs really are.