An atheist is simply anyone who rejects the theist claim.
No belief or disbelief is required. Atheist is certainly not a belief system. There are many valid reasons for rejecting the theist claim. The lack of evidence to support their claim is only one of them.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug