One observation I have heard over the years is that those from an ungodly background will have the more passion for the Lord as compared to Christians who have been brought up in a Christian home. The reasoning is that they have a greater appreciation of how vile the world is and how wretched their condition was before being saved. I dispute this reasoning.
For a start it has no biblical foundation. In fact the Bible warns us that passion that emerges in the first flush of experience of the Lord can actually be temporary. So, we read: The seed falling on rocky ground refers to someone who hears the word and at once receives it with joy But since they have no root, they last only a short time. When trouble or persecution comes because of the word, they quickly fall away (Matt. 13:20-21).
What actually determines how much passion we have for the Lord is our fellowship with Him now. It is not our background that matters it is our fellowship with Him now that matters. Those with enduring fellowship with the Lord are those who have passion for Him.
Those who have had big conversion experiences tend to start off with much vigour because of the mighty working of God to bring them to Himself. But over time this fades and their passion for the Lord will not be based on that experience, but on how much they are knowing the Lord now.
This reminds me of the man who said he had a great testimony of what the Lord had done for him which was written on a sheet of paper and stored in a drawer at home. It was all in the past and there was no reality of it all now
Regardless of background the ones with enduring passion for the Lord will be those who are going on to know the Lord. So the person from a Christian family will know the vileness of sin, the glories of Christ, the preciousness of salvation, the plight of the lost when he/she is in close fellowship with their Lord.