Why do some Religions make "Membership" a Requirement for Salvation?

There are so many churches to choose from! Why is it some of these churches have made it a requirement for their members to be a baptized, and "loyal" member??? Is there ANY-WHERE in the Bible, that membership and loyalty to a "Legal Organization" is a requirement for salvation? There is... show more There are so many churches to choose from! Why is it some of these churches have made it a requirement for their members to be a baptized, and "loyal" member???

Is there ANY-WHERE in the Bible, that membership and loyalty to a "Legal Organization" is a requirement for salvation?

There is one church that makes it clear, if you should join them, you must be loyal to their doctrines, teachings, and have a deep respect for their leaders.

If you question their teachings, you will be removed by their congregational "police force" the "elders", and then thrown outside of their church for insubordination.

WHY do these sects make Membership a "spiritual requirement" that is tied into our salvation?

why?
Update: Yes, there are many examples in their literature that point specifically at their "organization: as the only way to gain "salvation" with God...ONLY through them. This is a documented fact, that is not worthy of our effort to publish a link here. If a link identifying this sect is placed here at Yahoo Answers,... show more Yes, there are many examples in their literature that point specifically at their "organization: as the only way to gain "salvation" with God...ONLY through them. This is a documented fact, that is not worthy of our effort to publish a link here.

If a link identifying this sect is placed here at Yahoo Answers, this ever-present membership "double-teams" to have those offensive, and true Questions, removed, or deleted.

This is also proof of how they control their members from the inside of their organization as well, and they are here, causing the spread of more lies, when they are told by their leaders to "Not be on chat-rooms, or websites that feature scriptural beliefs contrary to those of the Borganization"
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