Questions 1 & 3 are linked, people were prone to create there own gods and still do today. Mankind was given free will, so temples were built and atheists rock on today
And number 2, evolution is still just a theory. Even if it were proven to be fact, who's to say it's not Gods mechanism anyway? We know the chemical make up of fire, but that doesn't mean we've proven or disproven the igsistance of God.