[conservonator]

For Protestants, those who do not accept core essential scriptural belief exclude themselves from scripturally-based Christianity.

What are the "core, essential, scriptural beliefs"?

[Quester]

For Protestants, those who do not accept core essential scriptural belief exclude themselves from scripturally-based Christianity.

What are the "core, essential, scriptural beliefs"?

The Apostles'/Nicene creeds are a good representation of these beliefs.