All ideas have a cause. The cause must either be inside me (mankind), or something else. Infinity and perfection are not within me(mankind), so the idea of an infinite and perfect God must have come from something outside me(mankind), so God must exist. I don't want to make another post about this but Can evil be created? or is evil is just the absence of peace? Note that you can have light in a jar but you can't have dark in a jar.