Why do God-believers hate atheists so much? Apparently they (the God-believers) find that an unwillingness to credit magical enchantment and mumbo-jumbo makes them (the atheists) untrustworthy:
Religion, in other words, has served a specific function throughout much of human history (beyond assuaging existential fears): It keeps people in line, discouraging them from engaging in selfish acts that hurt the larger community. Gervais and his colleagues point to recent research that bears this notion out; several studies have found people engage in less-selfish behavior “when reminded of watchful supernatural agents.”
If you believe – even implicitly – that the prospect of divine retribution is the primary factor inhibiting immoral behavior, then a lack of belief in a higher power could amount to a free pass. A 2002 Pew Research Center survey found nearly half of Americans feel morality is impossible without belief in God.
There you go, God-deniers: they hate you because, if don't live in fear of divine retribution from some celestial cartoon character, how will you ever know the difference between right and wrong?