Several religions in the world believe that you need to gain God's favor in order to gain entry to Heaven.
Christian's seem to have the strongest view of this (in my experience at least) and I've always NOT liked this.
Viewed from the Christian viewpoint, God created ALL of us out of love. Nothing can separate us from his love...except for sinning. If we were to sin (which the Bible claims that all of us do) if we do not ask for forgiveness, we will be sent to hell.
Other's view that God judges us all after we die, and we have a review of our life and are sent to the appropriate spot. But seeing as all of us sin, I guess we all end up in hell.
Well...I don't believe God is like that. Why would someone who loves us more than anything send us to hell for a few white lies? A man who is responsible for the death of hundreds is just as guilty as the little child that told a little lie to their parents? How does that sound fair?
I'm not saying that people can get away with adultery, murder, theft or all that...but think of it this way.
When we die, we go back up to what Christian's call: Heaven, no matter what. After our life is complete, maybe we are sent to a special room to review our life in front of Father God (or who ever, be creative at this point). Now in Heaven, we are beings of pure light and joy, keep this in mind, as it will come up later.
Upon reviewing our lives, we see everything we have ever done. Every bad thing we did really has an affect on us. We feel what it was like for us and the people that we harmed. Being a person of pure love and joy, these emotions take their tole on us.
But not all is lost. Our 'punishment' if you like, is to make up for what we did wrong. Reincarnation for example, is a way we can try it again.
Now in Heaven, some people say that it would be boring, because everyone is all 'goodie- goodie' and nothing bad would happen. Well, after a feeling of "did he just say that?" I knew how foolish this is. Heaven is a place where negative emotions/energies can not be. But it isn't boring at all.
There most-likely are parties, dances, feasts (many mythologies say that there are eternal feasts in Valhalla, etc), think of anything fun and pull out any negativity in it then add it to the afterlife. That's what it will be like.