The problem is the people worshipping, polytheistic nature of Christianity, which goes entirely against the message of Jesus, but the Romans used him the same way Amazon sells Che Guevara t-shirts, I guess. Add to that the Paulian "faith without works", the addition of purgatory and priests "absolving you of your sins" (so fuck around, you'll never find out! And Jesus "died for your sins" either way, whatever that means) and it's easy to see why Christianity can never work. The well has been poisoned for a long, long time. 'Jewish Christianity', like it was before Rome fucked the message of the J-man, sure, but not what we've had for most of the last two millennia. Christianity today is basically a religion for those who don't want to follow God's rules and deny divine judgement... thankfully, things are not so black and white and we were created with a kind nature so, despite everything the West has done with this West Asian man and his legacy, some goodness still seeps through sometimes and motivates people to strive to be better.
And btw, "good" Christianity (that practiced by Jesus and his followers and anyone who internalises the Sermon of the Mount, for instance) is just good/sensible Jewish Scripture +1, and Islam (without nonsensical, heretical hadiths and superficial a-Quranic traditions) is good Christianity +1. If you read, you'll understand. 👍