I have personally been involved in:
Teenage tree-huggery (good riddance)
Kemeticism (sometimes miss it)
Heathenry (now. Strong interest and study for a couple of years, only recently decided I was committed enough to claim the title if asked)
Have been in the vicinity of:
Christianity - various flavours, inc. RCC, Anglican, JW and LDS (dislike it, some denoms more than others)
Islam (dislike it)
Baha'i Faith (mostly like/respect it)
Fashionable watered-down Eastern-flavoured new agery (dislike it)
Buddhism (mostly like/respect it when it isn't part of the above)
Chinese folk religion (no real opinion. Almost completely impenetrable for an outsider)
Wicca (opinion varies based upon level of fluffiness)
Generalist/eclectic neo-paganism (as above)