Because the Roman Catholic cult teaches that he can pray to idols and dead people! If he has become a Roman Catholic, he has done nothing to bring about his adoption into the family of God. He has chosen to glorify an institution/cult, not God! His testimony is exclusively about how great is the cult of Roman Catholicism, with its bells and smells! He makes it clear about his prayer life with this testimony and glorification of the cult, not Jesus Christ!
Romans 1: 25 They exchanged the truth about God for a lie, and worshiped and served created things rather than the Creator—who is forever praised. Amen....
Romans 15: ... 5 May the God who gives endurance and encouragement give you the same attitude of mind toward each other that Christ Jesus had, 6 so that with one mind and one voice you may glorify the God and Father of our Lord Jesus Christ.
7 Accept one another, then, just as Christ accepted you, in order to bring praise to God.
Hebrews 13: ... 9 Do not be carried away by all kinds of strange teachings. It is good for our hearts to be strengthened by grace, not by eating ceremonial foods, which is of no benefit to those who do so. 10 We have an altar from which those who minister at the tabernacle have no right to eat.
11 The high priest carries the blood of animals into the Most Holy Place as a sin offering, but the bodies are burned outside the camp. 12 And so Jesus also suffered outside the city gate to make the people holy through his own blood. 13 Let us, then, go to him outside the camp, bearing the disgrace he bore. 14 For here we do not have an enduring city, but we are looking for the city that is to come.
15 Through Jesus, therefore, let us continually offer to God a sacrifice of praise—the fruit of lips that openly profess his name. ...
