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.
RE: John = Maria