People that believe in the muslim/Christian/jewish shared god: a little challenge for you?

in a paragraph please explain me why ganesh, one of the many hindu gods does not exist, even if millions of people believe in him DO NOT use the words bible or faith as i am ahteist and i wont take thos words seriously, then replace the word ganesh of your paragraph by God/yaweh/allah/jehova and you shall see why it doesnt exist :D