Not collecting stamps is a hobby if you meet with your weekly "not stamp-collectors" group and discuss how not collecting stamps is the better way of being and share support stories for not-stamp-collecting and write books on how you can be a very happy not-stamp-collector and find meaning in it.
Just like atheism is a religion when you go once a week to your CASH meeting to be with other "like-minded" people and give support, yada yada yada.