I don't believe it. Why? Because the Christian life always was too difficult and can't be done unless one is already saved. That's why the road is narrow and only those who believe in Christ for their complete salvation are saved. The road is narrow for one other reason. Christ is the stone that people stumble over. People can't seem to just trust Him. They can't believe that's all it takes. They think there has got to be some effort on their part.
Not only that a Christian is a new creation. Is it so hard to believe that the new man will never walk away?
People can believe what they want to, but I choose to believe that Christ can save to the UTMOST and that He means it when He says He will complete it.
When does someone enter into salvation? When they believe in Jesus and trust Him?