Because he found religion and joined the true Church.
Finding religion has nothing to do with becoming a Christian. A Christian is a person who through the Grace of God acknowledges that they are a lost sinner in need of a Savior, and that Savior is Jesus Christ. By believing that Jesus is the only Son of God, that he was crucified and on the third day was resurrected, and in repentance ask Jesus to forgive you and reside in your heart you will be saved.
A true born again Christian will still stumble and fall many times but according to I John 1-9 “ If we confess our sins , he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.”
Jesus gave his life for us as a free gift.
Ephesians 2 8-9 For grace are ye saved through faith; and that not of yourselves: it is a gift of God: Not of works, lest any man should boast.
Membership in any particular church is not what save you, it is your faith and trust in Jesus.
>> “Because he found religion and joined the true Church.” <<
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That’s OK, he’ll join the REAL true church when he meets Harold Camping...