Do christains know about the early church doctrine of Theosis?

Answer 1

Yes, but it's viewed differently within varying denominations. It has to do with seeking union with God (and in some circles, achieving a type of deification), but is explained in several different ways, depending upon theological perspective. The Church of Jesus Christ of Latter-Day Saints would understand it in a different way than the Eastern Orthodox Church, for example.

Answer 2

what is it