hey, if i want to belief that, somewhere in the world, exist real mythical creatures like a dragon or a unicorn or so) then i belief it, even if people say that mythical creatures do not exist and that i can do nothing to proof that i am right. the same goes for god.
*believe, proove
There's a difference between belief and hope. Usually a believer is convinced of the existence of a heaven, they do not 'want' to believe it; they already do. But many want to believe in a heaven, many simply hope there is one, because that's what they wish/hope for, out of fear of the lack thereof. It's your right to do so, but you're basically lying to yourself.