Sometimes some of the worst sinners are people raised in Christian homes, because they rebel against it. On the other hand, sometimes some of the greatest saints come from Christian homes. It just depends on the person.
We love to put all the blame on the parents. But we have a say about the direction we take in life, regardless of how we were raised (or not raised). In reality, we need to have our own faith. We can’t live off the faith of someone else. We need our own relationship with Jesus Christ.
Actually, one of the easiest places our hearts can become hardened to the gospel is in the church. As we hear the truth of the gospel, as we hear the truth of God’s Word, we decide whether we’ll be responsive or resistant to it.
Yes, hearts can become hard, even in church. So be careful.