When discussing a biblical topic—especially one that’s disputed—someone will sometimes ask:
But is this a salvation issue?
In Scripture, salvation is consistently tied to the obedience of faith meaning, you believe what God says therefore, submit to His words. So the more biblical question to ask yourself is:
Will this affect my “obedience of faith” that is, my belief in what God has said?
The New Testament does not separate believing from obeying. In fact, it regularly contrasts faith, belief with disobedience. Jesus warns:
“The one who believes in the Son has eternal life; the one who disobeys the Son will not see life, but the wrath of God remains on him.” (John 3:36)
Note the contrast between faith—belief in the Son—and disobedience. The outcome is spelled out in sobering terms when Jesus adds:
"Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven.” (Matthew 7:21)
Peter reminds Christians of God’s purpose in calling them:
“...according to the foreknowledge of God the Father, in the sanctification of the Spirit, for obedience to Jesus the Messiah...” (1 Peter 1:2)
Paul opens and closes Romans with the same defining phrase, framing his entire gospel message:
“Through him we have received grace and Apostleship, to bring about the obedience of faith among all the Gentiles for his name.” (Romans 1:5)
“...following the command of the God of the ages, made known to all the nations, to bring about the obedience of faith...” (Romans 16:26)
That repetition is not accidental. Paul emphasizes saving faith as faith that obeys the gospel he delivered. He even describes conversion as becoming obedient “from the heart to that form of teaching to which you were committed” (Romans 6:17).
The apostle John gives a simple test of authenticity:
“By this we know that we have come to know him, if we keep his commandments.” (1 John 2:3)
Hebrews makes the same point, tying salvation directly to obedience:
“Although he was a son, he learned obedience through the things that he suffered. And being made perfect, he became the source of eternal salvation to all who obey him...” (Hebrews 5:8–9)
Anthony's note on Hebrews 5:9 summarizes it well:
"Obedience to Jesus is the condition of salvation. Faith without obedience is false faith and cannot save."
In other words, true faith is inseparable from obedience as properly understood in New Testament terms, and it serves as the foundation for salvation (again John 3:36; Hebrews 5:9, etc.).
Therefore, debates over “faith versus works,” or whether this or that is “a salvation issue,” are unnecessary once the biblical concept of the “obedience of faith” is understood as the unifying key to salvation. The biblical measure of whether something is a salvation issue is straightforward:
Does this teaching or practice affect my obedience of faith—so that I can continue in the obedience that flows from what I believe?