The concept of tsim tsum is fascinating and few Christians explore it. As a conception it changes the view of the creation story and free will. Calvinism isn’t interested in that, but other’s might be, Arminians for instance.
Maybe.
Christians answer the question of how evil exists with the story of a rebellious angel, so tzimtzum would seem to be an unnecessary concept in Christianity.
It’s a gestalt perception switch. The common saying is ‘creation from nothing’, but from a Jewish perspective it’s more like ‘nothing (our world) from Something (God is the only true existence)’.