I would most likely classify myself as a Buddhist...which, technically, is a non-theist religion as there are only teachers and leaders, no god.
I have had what I call my "moral code" [encompassing strict vegetarianism, pacifism, and tolerance above everything else] since I was about 10 years old. When I was 19 I discovered that the principles I uphold are most closely aligned with the principles of Buddhism, so I started calling myself Buddhist just to make things simpler for people to understand.
I have an "OM" symbol pendant that I wear religiously [no pun intended], and I eventually want to get an OM symbol tattoo.