Muslims please answer honestly?

with every questions and answers i read the same thing keeps coming up from muslim people.the quran says this the quran says that,i appreciate your, [i think] misguided beliefs. but where is the proof.i dont know alot about religion all it seems to do is cause death.but yet people all over the world claim its true is it not just a case of brainwashing from birth by your parents as they were brainwashed by theres and soforth.the same applies for the bible but if i was to choose which were true ide choose the bible because that is what i was tought from an early age.though i myself am not particularly religious.and yes i guess i was brainwashed too.but choose to take religion very lightly.please show me proof mohammed ,allah exist.you cant its that simple.ill give you an example of why i dont believe.the tsunami who were the people mostly killed.[muslims] the pakistani earthquake [muslims] why would allah do this to his own people it just doesnt add up.