Is SS not a truth necessary to salvation?
“Is SS not a truth necessary to salvation?”
Assuming your abbreviation “SS” stands for Sola Scripture, the answer is no, Belief in Sola Scriptura is not necessary for salvation.
“Sola Scriptura simply means that all truth necessary for our salvation and spiritual life is taught either explicitly or implicitly in Scripture. It is not a claim that all truth of every kind is found in Scripture.”
A person can become saved and have eternal life without understanding SS or a great many other things.
Salvation is so simple a child can entrust himself to Christ for salvation.
Best.