You are right, there are christians and there are Christians. The bible says not all those that say Lord, Lord will make it into Heaven, Jesus will say to some, get thee from me, I never knew you. Jesus also said I would rather you be cold or hot, if you are lukewarm I will spew you out of my mouth. Nobody is perfect, we all have our failings, we will fall short at times, as Peter did, but God knows our hearts and will forgive if we ask. Jesus' sacrifice on the cross is for the forgiveness of all sins of all mankind, but we have to believe that and accept Jesus as our Saviour, those that don't are still in their sins and will face those sins at their death. I spent the first half of my life serving Satan, not realizing it of course, but I've spent the second half serving Jesus the best I could. Some have been saved on their deathbed, they will make it to Heaven but with no rewards waiting. It is risky waiting till just the last minute because we don't know when that will be, death can happen in an instant when we least expect it. Don't wait, do it now.