Not only your parents.. :) don't generalise.. You don't have to believe in 6000 GODs.. it is making you more childish.. it is kinda same like you don't want to wear any clothes because there are millions of designs.. same like scientific theories.. every subject has a past, with hundreds and thousands of theories.. religions were mentioning that there are invisible forces from ages.. science and people like you were laughing until we had some developments in science.. so today you might not agree with religion but you will die as a believer. :) or live a life believing on something. It is so childish to ask 100% evidence.. it is kinda same like you want to 100% know your results before attempting any test or examination.