Dooley, the cosmic microwave background radiation is always there, also at night. But it still is dark at night. Like the name says, they are just weak microwaves, which were sent after the big bang as normal light but are red shifted because of the expansion of the universe, so that they reach us as microwaves.
So the cosmic microwave background radiation is an evidence for the big bang and the expansion of the universe, not for creationism.