Jesus said that he will reject christians

Mat 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.

iniquity:

anomia
an-om-ee'-ah
From G459; illegality, that is, violation of law or (generally) wickedness: - iniquity, X transgress (-ion of) the law, unrighteousness.
Total KJV occurrences: 15

Why christians think that they behave like "godless" people and still think that they will be saved?

Repent means you won't do it over and over again like nothing happened.

Jesus rejected christians!