So why John would you think you are fit to enter heaven after death?

In and of myself, I have no hope WHATSOEVER of entrance into God’s heaven. My only hope is found in the word SUBSTITUTION – that there was One who stood in my place, that my very own sins were transferred to Him as He hung on the tree, that He bore the punishment that was mine, that He died in my place, that He drank the bitter cup of Divine wrath for me; and that grace upon grace, the righteous life of that One was credited to my account when I trusted in Him, and that I stand in His righteousness alone. I have no other plea but this: that based on the sure foundation of SCRIPTURE ALONE, that CHRIST ALONE the Perfect Savior is my Subsitute, and that He is mine by GRACE ALONE, through FAITH ALONE, to the GLORY OF GOD ALONE.