Hurray, As far as I know 1500 years ago, only one civilization was developed or modern, and that was the Tang dynasty China. Others were still lagging behind. Europe was still pretty backward compared to China and India. Look man, you cannot comment that lightly on religion and faith. You cannot look for scientific basis for everthing that people believe in. Its the faith, the belief in something that is required to maintain the social cohesion/order. Without it everything will fall apart. Mahankaal Bhairav, Kaal Bhairav on the one hand and calm Bishnu and Ganesha on the other has what has made the Hindu society of Kathmandu (including the Newar Buddhists) maintain the social hierarchy that gets altered (well, its not the right word but I can't think of it right now) in our day-to-day activities. And hey, if 1500 years ago people in Europe believed that a virgin could give birth to a baby, then why can't we believe that Mahankal Bhairav flew to Kathmandu? Also waht scientific discoveries were made 1500 years ago in Europe? I don't know of any scietific discoveries made in Europe then. Egypt is in Africa.