The way I look at it, as an atheist, there isn't any particularly compelling evidence for the existence of a god or gods.
Several hundreds of years ago, the Greeks believed in their pantheon of gods, and the Romans and Norse had their own pantheons of gods. These were their religious beliefs. As time moved forward, those beliefs were debunked and the religions were relegated to the realm of mythology.
Do you believe that Zeus is real? or Thor? or Lord Brahma? or Vishnu? If you don't, then you are atheist with regard to those old gods.
You simply believe in one more god than I do.