I don't "fear" either idea. I once believed in heaven but upon examination of the facts found that there's no objective evidence that it actually exists, along with its counterpart hell. The idea of heaven and hell is present in more religions than just Christianity.
Many people believe in heaven, mostly due to their upbringing. For some this is a personal choice and can help people cope with the difficulties of life. This is fine and dandy, until the point where a person's religious belief is imposed on others.