Romans 3:23 we are all sinners.

²³ for all have sinned and fall short of the glory of God. Romans 3:23

everyone of us, even us Christians are imperfect, because of imperfections we commit mistake or sins. No one in this world is clean or who has a sin-free life. But God did not want us to be a dirty-creature forever. He gave His only begotten son to wash our sins. John 3:16. and through this, we need to believe that He is the only son, Jesus Christ who carried all our burdens in the calvary and rose after 3 days. God is very gracious because HE never knew or even did not f0rget to leave us.
what we need to do, for us sinners, is to accept that we are sinner and receive Jesus Christ as our personal Savior. through this, we have the gift of salvation and our way to heaven.
Do not doubt because our God did it for us. Do not doubt that God did not make it. He make it for us, for us to be saved and be seen in Heaven!