The problem, as Dr. Bob and I have previously eluded to, is that Satan is in the counterfeit business big time, and there are millions of "cultural Christians" who claim the name of Jesus as their Savior, but follow a counterfeit gospel, worshipping a god they've designed who let's them live the way they want to live. They've never surrendered all and said, "God, do with me as you will." Rather, they've said something like, "Thank you for your gift of eternal life God. Now, let me live my life the way I want to, not the way you require." They may not have mouthed or actually thought these words, but their lives testify to that attitude.
How else could a practicing adulterer, alcoholic, h*omose*xual, etc., or self-serving person think they are saved? Yet, there are millions of them. How can a Gallop poll show 87% of people who call themselves Christians claim to have a personal relationship with Jesus Christ, and only 11% read their Bibles regularly? I'll tell you how . . . they are trusting in a counterfeit Christianity for their salvation. There will come a time when "Many will say to Me (Jesus) on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' And then I will declare to them, 'I never knew you (no personal relationship!); depart from Me, you who practice lawlessness (see also Luke 13:26-27).