Frankly, I don't care if you think I am preachy, rational. FWIW, I don't think you are very rational but I would find it tedious to call you on every post.
Yes, when you become a Christian, you do transform to the will of God. You do not change God to match the ways of the flesh (there I go preaching again, la la la).
It is a very silly exercise to cherry pick individual bible verses to meet some weird aim. It is much more, erm rational, to read whole portions in context.
The OT, to lots of non-believers, is not palatable because they zoom into parts when God is in a judgment mode. Satan loves when they do this. In truth, the OT is a love story between God and his people. They stray, he pulls them back, they stray, he pulls them back...
If God has put it on your heart to read and try to understand the bible, do it prayerfully, and meditatively. It is usually best to read the bible with other people so that you can discuss the particular verses.