The Roman church had and still has many satanists/luciferians (especially the higher up you go). These images have nothing to do with what it means to have a personal relationship with God, the Father, Son and Holy Spirit.
Quite often, religious art from the period you include images from are promoting gnostic ideas, that purport to convey Truth but don't.
Additionally, a lot of sculpture in the Vatican was pagan originally but renamed to represent Christian figures. It is all idolatrous (using substitutes for God, rather than having a relationship with God directly).
Many times, artists have been employed by those who are not truly following Jesus and are told to paint certain things. Other times, the artists themselves follow a hidden agenda to promote deceptive ideas.
No one should use DaVinci or any artists as a source of information about Jesus and his life.
You are right, nobody can even tell if there is a God. I am sure there is something like a creator. But nobody can prove this as well. We have to wait for the ultimate proof. My religion is to be good to mother nature and other human beeings. And I know that worshipping the devil isn't good. Even if he doesn't exist.
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There is a point that one can say there is a God, and that's when they know God personally in a relationship. There is proof but it's only direct proof, i.e. one person at a time and if a person seek the Creator/Truth in the first place.
Somehow you know worshipping the devil isn't good so there is something you've discerned already, even though you might not necessarily have proper proof of why.
Even people who Satan, the devil or Lucifer do good so there is something more than doing good...
Good luck on your journey :)