Do you have Scripture to prove this? If not it's just an opinion.
Referring to "death bed" repentance...
Eph 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
Christ does the judging, He will decide how sincere one is...
Joh 5:22 For the Father judgeth no man, but hath committed all judgment unto the Son: