While I'm far from being a scholar of the Bible, my reading of it led me to believe that you need to live the teachings: feed the hungry, visit the sick and jailed, to name a couple. And, to go forward and sin no more. And, while I'm sure that there can be cases of people sincerely repenting at the end of their lives, I would hope that it takes more than 'yikes, I'm dying so I better become born again' in which one is only saying the words to avoid punishment.
And.... if I were to find myself in 'Heaven' with people who are as hateful as certain of his followers are, then that frankly would not be my idea of Heaven.