What religions (and denominations within each) are completely exclusive when it comes to a happy afterlife?

noah: What religions (and denominations within each) are completely exclusive when it comes to a happy afterlife?
What I’m saying is, what religions (such as Christianity) or sects within a religion (such as Baptists, Methodists, or Mahayana Buddhists), state that you MUST practice/believe THEIR specific sect/denomination in order to go to heaven (or have a happy afterlife) after you die? I am curious to see exactly how many faith branches out there are exclusivists.

Thank you!

Answers and Views:

Answer by David
pagan beliefs are different ..

Hinduism says you have 84000 life cycles that a human being goes through.

and that for every 3-4 Billion years new universes are born

Answer by Messianic Atheism
Christianity is unique this way.

Religions that don’t require membership include: Islam, Judaism, Buddhism, Jainism, Sikhism, Paganism, Wicca, Taoism, and Hinduism. None of these religions have exclusive sects. Any group which is exclusive and claims these religions as parent is so unorthodox that it is invalid and possibly a cult (ie, Hare Krishnas and Hinduism).

The only groups other than Christianity I can think of are cults (Scientology, etc).