[Titanites]

It would seem to me a "Sola Scriptura Caucus" is not without merit. It would pertain to a good many Protestants (not all) that believes we go by scripture only.

It would be open to Muslims, too?

[xzins]

“sola scriptura” is a historic term that identifies a doctrine held by a number of churches that identify with the reformation.

It is actually concise. Moreso than trying to list all those denomination. It is also clear. Moreso than saying “reformed” which is a word used in very few denominational names.

[HarleyD]

It would be open to Muslims, too?

If they believe only the scriptures are the basis for faith. But then, there's that Koran thingy....