Performing works to prove ones faith is pathetic.The Apostle James I believe said faith without works is dead. It's not enough to just believe. Satan believes too. Jesus made it very clear that we have to do God's will, false prophet or not. And the Bible makes it clear that not everyone who claims Christianity will be saved. That those saved are a clear minority. If it were just a matter of belief it would be wonderful. But we do have to live a Christian life. Hebrews 9:27 "And as it is appointed unto men once to die, but after this the judgement."
Faith compels action. It compels the sinner to repent and to be reborn again, failure after failure.