Protestants proclaim to save themselves by their faith alone. God doesn’t make that proclamation. Protestants say that about themselves.
Here’s the difference. Protestants claim they are saved like Abraham. God saw his faith and credits him righteousness. Read that again. God sees his faith and credits him righteousness.
But God is out of the picture with Protestants. They claim faith and credit themselves righteousness. Abraham didn’t do that. Abraham didn’t say, “I’m saved by my faith alone! You’re not saved! And you’re not saved! But I’m saved!”
Abraham simply obeyed God because of his mighty faith. And Scripture says:
Rom 4:19 And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah’s womb: 20 He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; 21 And being fully persuaded that, what he had promised, he was able also to perform.
22 And therefore it was imputed to him for righteousness.