Problem is, the Bible doesn’t present one cohesive set of positive moral principles. It’s a collection of books written over hundreds of years by many authors with their own beliefs, biases and contexts, so it’s not possible to derive one set of “Christian values” from it. This means people will cherry pick bits that align with their pre-existing beliefs and dismiss or downplay whatever is inconvenient or contradicts them, and there are plenty of less than savoury parts to cherry pick from.

If i remember correctly (it's been a while), then the Bible becomes a lot more coherent if you throw out the old testament, and keep to the new testament only - which actually is what christians should do, because the sacrifice of Jesus is a new covenant which supercedes the old one with Moses.

If you keep to the NT, then there isn't so much ambiguity - evangelicals who cite from the OT are even more backwards than catholicism itself is.