It is possible that anyone could be Jesus Christ returned. We don't know what sort of sign God would give us if his Jesus were reborn into the world. So, it's a definite possibility since there's no way to prove that he isn't.
The founder of Christianity is Jesus Christ.
Jesus CHRIST! (hence the Christ....)
jesus christ
jesus christ
Jesus Christ
Jesus Christ.
The Lord Jesus Christ.
It was Jesus Christ.
Christ aka God the Son
Basically, Jesus Christ.
Jesus Christ is the founder of christianity.
Christ Jesus is the founder of the Iglesia Ni Cristo (Church Of Christ).