CHRISTIANITY IS ONLY POPULAR BECAUSE OF ITS IDLE THREATS.
Seriously. If there wasn't a threat of eternal damnation for those who reject Jesus then Christianity wouldn't be nearly as popular as it is today.
Take it from an ex-Christian, the Christian religion is built on fear mongering principles and is systematically designed to instill that fear into those that don't believe in it, so that the unbeliever will be coerced into thinking twice about what happens next after death as that dreadful panic sets in him about possibly ending up burning for eternity. All because Christianity takes a gamble on the "unknown" meaning "the next."
And so the question will be forced upon you which is "do you as an unbeliever want to take a gamble on the unknown and possibly be wrong about what comes next?" So you might as well play it safe and "be a Christian." Yes, this is the psychologicall tactic Christianity will play on you and is designed to do so. But I suspect Islam is constructed very similarly to do the same as well. It's just that Christianity has more followers still and perhaps because it does a much better job at doing that to people.
Fear of the unknown. Who ever came back from hell to tell us what it is about? According to the bible, two Satanic demons from hell (Dragon and son Beast) will rule the most powerful nation in the world (Revelation 17:18) which will defeat and corrupt Iraq and that nation is know as the Whore of Babylon. Therefore, President Bush and son W. Bush are two demons who came out of hell, so they could tell us what hell is like.
Maybe the fact that they are Satanic demons explains the murder of 1,000,000 Iraqis, torture camps, apathy toward hurricane Katrina victims, homelessness, pollution, logging, fracking, drilling offshore, denying Global Warming, disease, etc? In other words, elect a Satanic demon and the world will get messed up.
Many of the threats of Christianity were not idle.
1. Missions were built by fearmongering Native Americans, so that they would be slaves, tortured, beaten, and killed to build California missions for "Saint" Junipero Serra.
2. A scientist was tortured until he recanted that meteorites come from God's perfect heavens.
3. In Salem, those accused of witchcraft were killed if they were or were not found to be witches (the tests were not accurate.. . but they were horribly murdered either way, so it didn't really matter). The tortures and deaths were at the hands of a very pious branch of Christians, called Puritans, who felt that anyone who was having any kind of fun (song, dance, art, literature) was EEEEvil. Something tells me that those who see evil everywhere are, themselves, evil, because they are driven to do evil things to fight the faux evil that they perceive.
4. The Dark Ages were kept dark and ignorant by fear mongering priests who built great palace churches from the vast amounts of mammon that they collected from the scared and intimidated. The Mafia, too, was enriched by similar tactics.