You need to retake religious studies :) Seriously, your entire understanding of Christianity is wrong.
Catholicism is Christianity in entirety - it has essentially two main branches, Roman Catholic, and Protestant (or Church of England based Christianity, and also includes most other non-Roman Catholic Christian branches such as Baptists, Methodist etc, which are all offshoots of the CoE branch). But both sit under the label of Catholicism.
Protestants most certainly believe in the Holy Trinity of Father, Son and Holy Ghost, and while they believe Jesus was mortal, that forms the basis of being able to rise from the dead - his divinity after crucifixion comes from him conquering death and rising again. Oh, and they most definitely believe he is the Son of God.
Your idea of how salvation occurs is also completely broken for both branches of Catholicism - simply leading a good life won't get you any brownie points, you have to believe in Jesus Christ and the fundamental tenet that he died for humanities sins on the cross.