Individual believers makeup the body of Christ. It's an organism, not an organization and no believer thinks that the local denomination they attend is the real *church*.
Catholics say that you have to be Catholic to be saved.
Believers know you need to be believers in Jesus to be saved regardless of denomination.
There is a mixture of saved and unsaved in every local assembly because it's not baptism, church membership, denominational affiliation which saves.
It's faith in Jesus which transcends denominational lines.
Anyone can have "faith" in Jesus Christ. Mormons have faith in Jesus Christ. That's not the issue.
"Obedience" to Jesus Christ is another matter entirely.....
And your 7 year posting history is a supporting testimony that being Catholic believe in Jesus and are just as saved as those in the store front churches so many "individual believers" attend?