Going to church is not the same as being a Christian. A Christian is someone who has put their trust in Jesus’ sacrificial death for their sins, and therefore has been repented and been forgiven by God. Such people are changed forever (see II Corinthians 5:17). It is highly unlikely such people would desert God, because there is nowhere else where they would rather be:
‘So Jesus said to the twelve, “You do not want to go away also, do you?” Simon Peter answered Him, “Lord, to whom shall we go? You have words of eternal life. “We have believed and have come to know that You are the Holy One of God”,’ (John 6:67-69 NASB). When people know Jesus, there is nowhere they would rather be. People don’t become Christians because they wants perk or a quick-fix – they become Christians because nothing else matters. Following Jesus is not something you grow out of, it’s something you grow into. If you think it’s just about Sundays, you probably don’t know what it’s about.