People should be left to believe what they like, so long as they harm no one else. Apart from normal expectations of politeness, it is not however clear why people should require their personal beliefs to be treated with special sensitivity by others, to the point that if others fail to tip-toe respectfully around them they will start throwing bombs.
Life, Sex and Ideas: The Good Life Without God (ed. Oxford University Press, USA, 2004) - ISBN: 9780195177558