You might think you're going to Heaven when you're not! ? this ones for christians?

I don't think it is enough to 'only' have a belief that Jesus died for you. As a Christian, I cannot commit aimless amounts of sinful acts, live a life oposite to what God desired for me, and then expect that I am being escorted to heaven based on one belief. However, there is not one person since time, (except Jesus himself), that has not comitted sin. This is what he died for. However, we can be forgiven for our sins by repenting and turning from our evil ways. In addition, you have to remember the differences between the new and old testament in order to better understand some of your references. It is extremely important that we live our life according to Gods purpose, repent from sin, and have a relationship with Jesus by obedience, worship, and love.