I don't mind one way or another what people choose to believe in their hearts, what I do disagree with is the attempt to institutionalise it. Someone's belief or disbelief in heaven or God has no impact on me personally, however, religious institutions do attempt to impinge on my opinions, as the recent debacle with the UN 'Anti Religious-Defamation' act, there's a bag with a bear-trap in it if ever I saw one.
I don't believe in the idea of criticizing someone for what they believe, however, that's not the same as criticizing what they believe, it's almost as thin a line as the one between 'criticize' and 'attack'.
I think everyone's belief is unique to a certain degree, and to try and regiment those beliefs, to use an eternity of torture as coercion for joining their 'club' etc, makes organised religion a dangerous thing.
It's like the medicine man, he is the man in charge of both the initiation and the law of the tribe. You more or less live or die at his say-so. In many ways priests can be similar, they claim God is judging your soul, but the fact is that it is they who are doing so, it is they who claim you to be a 'sinner', not God.