This pissed me off so fucking much when people defend Christianity by saying that all of the bad shit is in the Old Testament and that the New Testament is totally fine.
1 Corinthians 6:9
"Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,"
Gay people and gender non-conforming people are not allowed in to heaven
1 Peter 3:1
"Likewise, ye wives, be in subjection to your own husbands;"
It's still an extremely misogynistic book even in the new testament
Romans 1:26-27 ... 32
"For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
...
Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them."
Both homophobia and misogyny
I could go on and on, and I probably will in the comments, but it's pretty fucking clear that all the nasty bigoted shit in the book just doesn't go away in the New Testament
You cannot separate the bigotry from the Bible. The Bible is very clear that you cannot pick and chose, that you have to accept the full book or none of it, you can't just take the verses you like and still be Christian. To be a good Christian who follows the entire Bible you must be bigoted
Most religions don't actually put a premium on following every single part of their holy text. I mean, a lot of religions don't even have holy texts period. To claim otherwise implies that religion only existed after the invention of writing, which is obviously untrue.
Now Christianity as an Abrahamic religion does put emphasis on holy text, so Christians are kinda stuck if their holy text turns out to be trash. And religions that don't have holy texts are extremely syncretic, far too syncretic for your average Christian's (and honestly most Westerner's) conception of religion.
By syncretism, I mean something like "Jesusist" running around with text taken from the Bible and the Quran about how Jesus is cool mashing them together with various Buddhist text about some bodhisattva is actually about Jesus, who is styled as the messiah bodhisattva christ by Jesusist. And "Jesusism" isn't just one mashing of text, but multiple schools with different proportion of mashing, so one school of Jesusism mostly pull from the Gospel while another school is mostly Gnostic text and the Quran while another is basically just Buddhism with Jesus characteristics. With this understanding and practice of religion, you could found a particular socialist Jesusist school where you pick and choose parts of the Bible/Quran/Buddhist texts that crafts a socialist figure out of Jesus.
There are already syncretic religions that use Christianity. Cuba has Santeria (and there are some people who say that the amount of actual Cuban Catholics is pretty low but practitioners of Santeria aren't suppose to reveal their religion to non-practitioners, so they just say they're Catholic instead.). I believe the various Indigenous peoples in Bolivia had also sycretized Christianity with older Indigenous beliefs and practices. Bolivian Indigenous Christians will incorporate worship of Pachamama into their religious practices, and no amount of pointing to the Ten Commandments will stop them from continuing to offer burnt offerings to Pachamama during the Summer Solstice.
The main problem with Christianity is that it isn't a religion that lends itself well with syncretism (despite the ultimate irony that Christianity itself has syncretic roots of Messianic Judaism mashed with various mystery cults and neo-Platoism), but a religion of unchanging dogma. This dogma can be bend, have parts of it be overruled by newer dogma, and even have parts be somewhat selectively ignored, but you can't just cut out the parts you don't like like syncretic religions.