If a Catholic leaves his Church, and outside that Church lives a good and devout life, could he be saved?

The Catholic Answers

You give an impossible case. To live a devout life is to live a life devoted to God. Now no Catholic can have a really sufficient reason to doubt the truth of his Church. If doubts do come, he owes it to God to make sure of his position before he acts, and inquiry will show such doubts to be unfounded. If he leaves without such inquiry, he is to blame for throwing away the best of God’s gifts. If he inquires sincerely, he stays.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty