Yes, but the likelihood of any born-again Christian remaining in the Catholic Church long term is slim. Upon justification, the Holy Spirit begins the process of sanctification in every new believer. This will ultimately lead a believer out of a false church and to worship God in Spirit and truth (John 4:24). It is the commission of every Bible-believing Christian to call victims of deception to freedom in Christ by the truth of His Word (John 8:31-32).

If a Catholic says he is truly born-again, but refuses to leave his false church, we must treat him as an unbeliever. By their own profession and expression of faith, they are choosing to continue practicing the sin of dolatry. Catholics believe that the Eucharist is the true body and blood of Jesus Christ and must be worshipped. Prayers and veneration are regularly offered to Mary and saints. Relics of past saints are idolized in the church, in fact, every altar in Roman Catholic churches contain a relic (a bone fragment or some body part) of a martyr or saint. This practice of idolatry can be fatal because the Bible clearly states that those who practice idolatry will not enter the Kingdom of Heaven (1 Cor. 6:9-10). Catholics must flee from idolatry to be saved (1 Cor. 10:14). May God remove the veil of blindness that covers every unbeliever’s heart when they turn to the true Christ (2 Cor. 3:16).