Salvation is all of grace and Christ's work

Eph. 2:8-9, says salvation is not by works, not of ourselves. The Roman Catholic Church (RCC) says it is of yourself and by works of the RCC. Luke 23, the thief on the cross, proves salvation is not of ourselves, by any sacrament or work. Salvation is by grace through faith alone, because that is all the thief demonstrated and was saved. He did not partake of baptism or the eucharist; the same for Enoch and Noah.