If these people have truly put their faith in Jesus Christ to forgive them of their inability to reach God through their own feeble efforts, then they will be in heaven for all eternity along with anyone else that has done the same. That doesn't mean that they have figured out life, that they no longer make mistakes or that they even understand doctrine or God completely, but it does mean that they are forgiven and that they can have a relationship with the God that created each of us.
Once they get to heaven God will finish the work he began on them when they began putting their faith in him, and he will perfect them. Some of us will need a lot of perfecting, but nevertheless God will be capable of doing what he does best, restoring people and forgiving them. Eternity in heaven is more about being with a God that loves us perfectly, not hanging with celebrities or people that bug you!
Just think, the God that created this world in a few days, with all its incredible beauty and variety, has been working on heaven for thousands of years. I can't wait to see it and begin exploring His new creation along with believers that have been saved by his miraculous power, through Jesus Christ!