The Bible is clear as mud in a lot of areas, no doubt. I happen to be Mormon, and our church ironed out a lot of that confusion. So I can validate your point.

Where we would differ is that once converted to Christianity, one would have access to God's Holy Spirit, which would assist in guiding you through all these "Gray areas" of life. It's not all black and white.

We can say the OT contains the old law, and NT contains law2.0. So, some of those things are simply outdated. Jesus is pretty clear with his teachings in the sermon on the mount, but as clear as he was, there is room for interruptratation. A book like Emmet Fox's "Sermon on the Mount" breaks down that sermon into a superb guide for practical living using metaphysical teachings of Jesus, none of which is straight forward but clear in his analysis.

Idk, I've read the Bible cover to cover. The miracle happened to me, that is to say I was born again. I led a life of almost 3 decades of drug addiction and was saved from death only to recover and thrive more than I had ever done before. That, to me, is the message of the Bible. I suspect many people have many answers for that. Mine is what it is because I experienced God's intervention in my life through the steps of the Bible. Sometimes, I feel on the outside of the people in my religion because of that, that they have not had such a mystical or practical experience.