Exactly. Faith is NOT static, it is DYNAMIC as you opined.
“Even so Abraham believed God, and it was reckoned to him as righteousness.”(Galatians 3:6)
Abraham was called by God to move out of the land of his fathers. He did so. What God told Abraham to do, he did it (sometimes not so perfect but he did it). Faith in action. Faith also implies FAITHFULNESS.
Indeed, I think that was the point of what Paul wrote in 1 Cor. 10 as he discussed the Israelites that were saved by crossing the Red Sea only to fail and be executed for their unfaithfulness.
Paul called them examples for us to consider and learn from.
People say they are “saved” and may be but that salvation is contingent upon continued faithfulness.