Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only he who does the will of My Father in heaven. 22Many 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?’ 23 Then I will tell them plainly, ‘I never knew you; depart from Me, you workers of lawlessness'.
Lawlessness- those not following His laws, His instruction, doing His Fathers bidding, "loving above all things".
Believing Jesus existed and believing on or in Him isnt the same thing. Believing in Him, people will believe His words and that they have to believe they have to do His bidding to be saved, or Satan would be saved.
Romans 10:9, If you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.
