Even if there is no God, there are serious problems with atheism.
Part of the belief in "god," is a corresponding belief in the incalculable value of human life. To an atheist, humans are simply highly-evolved animals, having no more intrinsic value than any other animal. Hence, it is OK to release fresh water from vast reservoirs in the California mountains in order to provide conveniences to fish and other wildlife, while people who could otherwise use that water suffer. Humans have no more right to the water than the fish, eh? Atheists worry equally about "endangered species" and human suffering (though they would deny it vociferously). The proof is in the countless situations where human rights and prerogatives are taken away in the interest of, for example, "preserving wetlands."
An atheist has no problem with abortion because a fetus is just tissue, until the mother decides that she wants to nurture it. Same for euthanasia, and if atheists are honest, they would have no problem exterminating the severely retarded, severely deformed, elderly with total dementia, or people in a persistent vegetative state. The world would be a better place, don't you know.
Atheist leaders in the USSR, China, Cambodia, North Korea, and elsewhere were responsible for massive killings in the interest of attaining political objectives.
Atheists have no rational justification for altruism or charity. They depend on "Government" to take care of the poor, the homeless, widows and orphans, both at home and abroad. How many atheist organizations are analogous to Catholic Charities - which provides food, shelter, medical assistance, drug counseling, etc., expecting NOTHING in return from the beneficiaries? I count ZERO.
Atheists disdain the lessons of history - as codified by most religions in their commandments, mitzvots, whatever: the importance of a strong & robust institution of Marriage, the importance of a sound and solid nuclear family, and they deny the harm done by "victimless" crimes such as prostitution, drug abuse, and adultery (assuming discretion).
Worst is the arrogance of atheism. In effect, atheists believe that, in essence, each one of them is a "god," capable of absolutely defining good and evil based on their own personal knowledge and experience. The idea that there might be some higher power or supervening intelligence is inconceivable and absurd.
Yet essentially all atheists claim to be "good people," and "nice guys."
Anyone can be "good" if you allow them to define what "good" is.