John 3:5, unless a man be born again of water AND the Holy Ghost, he cannot enter into the Kingdom of God.
So both, of course, because God’s Word says it.
But how do you know you are born again? Do you only think you have received the Spirit?
I ask because a born again believer could not stay in Catholicism. True Christianity and Catholicism are two different animals. One is of the Spirit and the other is of the flesh.
http://www.reachingcatholics.org/catholic_saved.html
No one who is truly born again of the Spirit will ever go thru the motions, rituals, and sacraments of the Catholic church.
I know I won’t convince you of that but am called to testify to it anyway.