Absolutely not.
It is through Jesus that one is saved.
And yes, people can pick up a Bible and come to salvation through reading it because it points to JESUS.
A church, any church, is NOT necessary for someone to be saved, because God saves, not churches.
And subjectivism and individualism are the enemies of that salvation. They lead to moral relativism.
Their roots are to be found in the Reformation.
A church, any church, is NOT necessary for someone to be saved, because God saves, not churches.
The Church is the Bride of Christ.
See Ephesians.