I know that the baptsit church believes in this, and that some non-denominational churches do as well. I'm not sure about what other denomination believe in this as well.
The Seventh Day Adventist Church (of which I'm a member) doesn't believe in this. I can't speek for the whole church, but all the SDA members I know don't think there's proof in the Bible to show that we always will be saved. Being saved is a whole life gig not just a one time deal that you can make with God and then do things morraly and ethicaly wrong.

~~Of caurse I could be wrong. No one will know for sure untill God returns.
The Seventh Day Adventist Church (of which I'm a member) doesn't believe in this. I can't speek for the whole church, but all the SDA members I know don't think there's proof in the Bible to show that we always will be saved. Being saved is a whole life gig not just a one time deal that you can make with God and then do things morraly and ethicaly wrong.

~~Of caurse I could be wrong. No one will know for sure untill God returns.
