How compatible are the beliefs of atheists and Buddhism?

I looked around and found a couple of questions and answers on the site that discuss atheism in Buddhism, https://buddhism.stackexchange.com/questions/1690 & https://buddhism.stackexchange.com/questions/1581 it looks like belief in a supreme being may not be a requirement for being a Buddhist. Strictly speaking it is possible for a person to identify as an agnostic or atheist and also identify with any mono or polytheistic church. Though most (*all?*) of those actual religions do not support disbelief in their God(s), so they are not actually compatible. Are the concepts of agnostic or atheist believers compatible with Buddhism? Does the entire belief system or specific sects require the belief in any or a specific supreme being?