Judaism does ban homosexuality...there are references to it in the Old Testament.
That's where some Christians get their bans on it, however, Jesus never makes any specific reference to it.
Many conservative Christians use the OT to condemn gays, but ignore a lot of the other OT laws, picking and choosing what fits their agenda. Jesus summed up the OT laws in his two commandments, "Love your God with all your heart, and all your soul, and all your strength and all your mind, and love your neightbor as yourself". He never makes any other mention of things like women cutting their hair, speaking out in church, as Paul did, which were cultural issues, but which were construed as sin. We ignore those things in most modern churches, yet we focus on OT laws, when Jesus came to fulfill the law. It doesn't make any sense why people pick and choose, except that what is "taboo" is more titillating.
In Judaism, their salvation is based on following ALL of the OT laws to the letter of the law. In Christianity, salvation is not based on works, but on faith in Jesus, because His death on the Cross fulfilled all the Law. Our faith in Him will automatically want to make us carry out good works as a testimony of the salvific faith we have.
We can and never will be perfect. We are human, if we relied on our good works to gain entrance into heaven, we'd be striving forever, and always come up one step short. Humans are born imperfect, it's just the way we are. Thanks to Adam and Eve, we are all born with sin and lost our perfectibility. Martin Luther summed it up well in his hymn, "A Mighty Fortress" when he wrote: "Did we in our own strength confide, our striving would be losing; were not the right one on our side, the Man of God's own chosing. Dost ask who that may be? Christ Jesus is is He. Lord Sabaoth His name, from age to age the same, and He will win the battle."
God and Jesus don't care what we've done in the past, they are here to forgive.
They love us all whether straight, gay or in between. People may twist Bible passages and take things out of context, but the truth of the matter is that we all need God and we're not going to get to Heaven without God.
No mention is made in the NT by Jesus of homosexuality. Paul talks about it, and for him, I think it is probably more of a cultural thing. In the Old Testament, there are references against it, too, but there are references to not touching women who are having their periods, eating shellfish, and mixing dairy and meat in the same meal. When is the last time that you had some shrimp or a good greasy cheeseburger? You've sinned according to the Bible. Women aren't supposed to cut their hair or talk in church, either, but I bet that all the women on here cut their hair. They've sinned, too.
As an evangelical Christian, it bothers me when my fellow Christians get up and holler and shout and carry on about things being right and wrong, but they are so hypocritical. In my book sin is sin is sin. I know that I don't do all the right things everyday, so I need to ask God for forgiveness. That's what's so great about being a Christian. I know that God loves me and will forgive me, eventhough I'm a sinner. God is a loving God, God doesn't want to alienate anyone from Heaven.
That's why I just don't believe and can't believe that He's going to condemn gay people unless they non-believers, in which case they will be with all the other non-believers--straight, gay, whatever. Jesus preached a Gospel of love, not hate and that's what the church needs to focus on, because many more people would be served and healed.