All I can say is for those who believe this, you forgot to read the warning to the 7 churches.
The 7 church warning is not to the unbelievers in the those churches, it is to the believers in those churches.
This is an old once saved always saved argument that goes round and round here.
If you want to believe that, fine.
But please don't imply that we don't understand scripture when we do not see it your way.