Christianity began as a non-denominational group after the ascension of Christ. Since then, there have always been groups that have not been aligned to any of the formal denominations. Non-denominational churches have increased in the post war period as many become disillusioned with the mainstream denominations.

Non-denominational Christianity, Lutheran Christianity, Presbyterian Christianity, Messianic Judaism, Social Christianity, Baptist Christianity, Methodist Christianity, Pentecostal Christianity, Protestant Christianity, and regular Judaism.

No. A Pentecostal church is a church that believes in speaking in other tongues. A non-denominational church is a Christian church that doesn't claim any specific denomination of Christianity. Many non-denominational churches speak in tongues, though.

No. They are non-denominational and teach straight Christian theology.

Scientology is non-denominational, non-profit and non-discriminatory.