Some religions believe that snake and cows are sacred beings, others believe in spirits. These seem illogical to those who don't believe in them. Muslims accuse christians for their believe in trinity that to them seems ludicrous. Yet they've no difficult believing in the absurdities of Quran like the jinns, creation of Eve from the rib of Adam, the story of Noah or the splitting of the moon. Its not clear why all other unreasonable beliefs are wrong but theirs is right. If we do not use reason to distinguish which faith is the right one, how can we pick the right religion? There are myriads of faiths that are all irrational yet all say that their faith is above reason.