The OT represents a version of God that most modern Christians are uncomfortable with: one that hates homosexuals and calls them an abomination, one that is a fierce advocate for one tiny group of people and who encouraged them in the past to commit all manner of atrocities, one that has all manner of hyper-limited laws.
This is why the Marcionites were decreed a heresy in the Second Century.
That's not a good question to ask me. I'm an atheist. All I know is what the books say. And then there's Jesus famous quote in Matthew 5:18.
Personally if I were to believe in a God I would want one that was logically consistent. If God is real then he is unchanging and his rules are eternal. None of this "special cases" sort of stuff that just reeks of human machinations.
It's part of why I don't find any evidence for God to be compelling.