There's no reliable evidence for God/Yahweh, Jesus, Allah, Zeus, Vishnu, Thor, or any of the thousands of other gods that people have worshiped. If any of the major gods existed, there would be reliable evidence. Since no such evidence exists, these gods do not exist. There's also extensive evidence that they are all just myths, created to help soothe our fear of death, and perpetuated through religion to subjugate the underclass into obedience.
Science has shown that there's no need for gods to explain the traditional reasons for a god -- origin of the universe, origin of life, origin of species, origin of humans, origin of morality. Science also shows us the psychological reasons that people believe in god(s). See the 1st link, "Andy Thomson: Why We Believe in Gods."