Do people who either believe of don't believe about the existence of God, have any solid evidence ?

Remember that rules of logic dictate that the burden of proof falls upon the affirmative position: that a god DOES exist. Atheists have no obligation to prove or disprove anything. Otherwise-if you demand belief in all beings for which there is no absolute disproof -then you are forced by your own twisted "logic" to believe in mile-long pink elephants on Pluto, since at present, we haven't explored Pluto and shown them to be nonexistent. The idea of the Christian god only seems more rational than the pink elephants or the Greek gods because we've been brainwashed into accepting the Christian god by repetitive parental and societal propaganda.