Hell's Best Kept Secret

I knew a guy who told me at the gym one day, "I've been walking with the Lord about a year now." Apparently, he attended a very large Baptist church. However, he was a male stripper, and he saw nothing wrong with that. That shocked me. How can you be a male stripper, and yet, at the same time, consider yourself a Christian? Seems to me there's a huge contradiction there. Kind of reminds me of Hustler magazine's Larry Flynt, who claimed, years ago, to be "born again," yet continued to publish the pornography magazine.

Walking forward in a church service, or repeating some words in a prayer, does not magically save a person from Hell. Claiming that you are a Christian, and then going out and living wickedly, is a contradiction. If the heart is not changed, then the person was never truly born again...no matter what they may claim.

"By their fruit you will recognize them. Do people pick grapes from thornbushes, or figs from thistles? Likewise every good tree bears good fruit, but a bad tree bears bad fruit. A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit. Every tree that does not bear good fruit is cut down and thrown into the fire. Thus, by their fruit you will recognize them.

"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven. Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?' Then I will tell them plainly, 'I never knew you. Away from me, you evildoers!'" (Matthew 7:16-23)

"He taught them many things by parables, and in his teaching said: "Listen! A farmer went out to sow his seed. As he was scattering the seed, some fell along the path, and the birds came and ate it up. Some fell on rocky places, where it did not have much soil. It sprang up quickly, because the soil was shallow. But when the sun came up, the plants were scorched, and they withered because they had no root. Other seed fell among thorns, which grew up and choked the plants, so that they did not bear grain. Still other seed fell on good soil. It came up, grew and produced a crop, multiplying thirty, sixty, or even a hundred times."
"Then Jesus said to them, "Don't you understand this parable? How then will you understand any parable? The farmer sows the word. Some people are like seed along the path, where the word is sown. As soon as they hear it, Satan comes and takes away the word that was sown in them. Others, like seed sown on rocky places, hear the word and at once receive 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. Still others, like seed sown among thorns, hear the word; but the worries of this life, the deceitfulness of wealth and the desires for other things come in and choke the word, making it unfruitful. Others, like seed sown on good soil, hear the word, accept it, and produce a crop—thirty, sixty or even a hundred times what was sown." (Mark 4:2-8, 13-20)

Why do some of those making a decision for Christ fall away from the faith? What is the principle that Spurgeon, Wesley, Whitefield, etc., used to reach the lost? Why has the modern Church, and modern evangelists, neglected it?