Buddhism is often erroneously described as atheistic, when in fact traditional Buddhist cosmology explicitly acknowledges the existence of countless gods or devas. (And yes, the devas are in fact considered to be deities, though not always in a way that monotheistic Westerners would recognize).
It would be more accurate to say that Buddhism is untheistic. It does not have deity-worship or the cultus of gods as its central focus for the most part, though there are important exceptions to this. Devotional activity does figure into Buddhism, and it actually has a larger part in Buddhist praxis than many Westerners would like to believe.