when a religion becomes a cult? what seperates religion from cults?
Mostly, I think, it's a matter of degree of acceptance by the general public.
in my opinion, a cult is an organization that teaches harmful teachings.
I'd have to disagree with you there, as "harmful" is a pretty relative term. Lots and lots of people use the word "cult" to describe pretty much any religion they disagree with. It's kind of like the worst thing you can call a religion, so it's used more for religious mud-slinging than anything else.
To me, a cult -- dangerous or not -- is a group that uses excessive mind-control over its members, threatening them with complete isolation from those the have come to rely on should they decide they want to leave. A cult tries to limit its members' access to information other than information supplied by the group, and restricting its members from interacting with people on the outside. It typically induces fear in its members, not so much of physical harm, but of spiritual and emotional isolation.