Many mistakenly attribute the creation of the universe to this entity. However, this is not accurate. At best, God was smoking a reefer when things got started up - at worst, God doesn't exist.
More wars and irrational slaughtering have occurred in the name of God than in any other name. All said, the death-toll is believed to be at least, in collective, the total population of the Earth as it stands today.
Prayer is an act typically directed at God. However, there is no statistical correlation between prayer and the desired outcomes asked for in prayer. Therefore, if God does exist, it's statistically proven that it doesn't care for the plight of man.
The concept of God, in the west, is largely associated with Abrahamic faiths, namely Christianity, Islam, and Judaism. These faiths are also the three major monotheistic belief systems of the word and are each, in their own regards spreading a dangerous meme in which God is portrayed as kind, good and merciful. God is none of these things.
Historically, according to the old testament, God is a petty and jealous being. These are the earliest records of existence and concept of God.
Religions that lack a God tend to be more objective and peaceful. For an example, see Buddhism.