From my studies, the only thing that would send us to Hell would be to deny Jesus as our Savior. But that even in believing Jesus as our Savior does not mean we will be perfect even in death or even strong in life no matter how hard we want to we strong in life.
I have wondered about this because I know of a Christian who loved Jesus with all her heart and suffered from co-dependency in a dysfunctional home.
She suffered for so long and asked Jesus so carry her into heaven to live with Him as she sliced her wrists 3 1/2 inches on one wrist, 3 inches on the other wrist and 4 inches in the upper thigh. She wrote that her Hell was on earth and that she couldn't stand one more day of it. She wrote that she prayed to God, as she performed her murder on herself, that He would forgive her for this sin as He had forgiven her of the others she had done in the past. She stated that the Bible says that He will not allow one to stand more than one can bear and that He is our strength. She stated that she wasn't strong--knowing the Lord is strong but not her and asked to be carried to heaven to live with Him from that moment on.