The gnosticism underlying fundamentalism: Correct knowledge is essential to salvation

Not just knowledge, but correct knowledge.

Michael Williams says so twice so you get it, here:

[N]early 95% of the people who claim to be a Christian cannot articulate or answer simple questions correctly about how they know they are saved. ... Nearly 95% of the people who claim to be a Christian cannot articulate or answer simple questions correctly about how they know they are saved.