Faith without action is dead faith.
Nevertheless, it is not the action, but a living faith, that saves.
Rom 4:4, Now to him that worketh is the reward not reckoned of grace, but of debt.
If Abraham was saved because he offered his son Isaac on the altar, then salvation is owed to him by God.
Abraham's salvation was by faith apart from works (Romans 4:1-8).
Rom 4:5, But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
Abraham's faith, apart from works, was counted to him for righteousness; and likewise, when we have faith, it is counted to us for righteousness, apart from works.
Now if we have a genuine faith, our hearts are changed from the inside out; and we will be inclined towards doing good works.
But what if we have received such a heart change; but then get run over by a bus on the way home from the church where we got saved?
Are we then consigned to hell?
I don't think so.
Even though there are no works attached to the faith that we received, we will go to heaven because it was a genuine faith, apart from works, that saved us.
If we had been allowed to live on, the living faith produced within us would no doubt have produced good works; and our faith would have then been shown to have been living.
But man looks on the outward appearance and God looks on the heart.
In the instance where a man receives genuine faith but then has no opportunity to do any good works, God sees the heart of that man, that his faith was genuine.
Likewise if someone is a parapalegic and cannot do good works as the result.
In the case of Joni Earickson Tada, was she saved because she painted paintings with the paintbrush in her teeth?
Were her paintings even anything that might be considered to have been of eternal value?
Perhaps, if somebody looked at one of them and gave their heart to Christ, it could be said yes.
But if not, why would the fact that she painted something with a paintbrush in her teeth be of any salvational value to her?
What matters for her is the fact that she believes in Jesus. If her paintings reveal to us that she has faith, then her faith is not dead because it has attached to it works that show that her faith is genuine.
But the works show her faith before man; not before God.
Even without those works, God knows whether or not her faith is genuine.
Rom 4:2, For if Abraham were justified by works, he hath whereof to glory; but not before God.
Abraham, because of his works, was justified and had whereof to glory, before men and not before God.
Because it is written,
Heb 4:13, Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
So, God looks into the inner recesses of Abraham's heart and determines that he has a genuine faith, apart from Abraham's work of offering Isaac on the altar.
Of course, even before God, Abraham's work proved that he had a genuine faith.
But God knew that his faith was genuine even before he offered his son on the altar.
As it is written,
Gen 15:5, And he brought him forth abroad, and said, Look now toward heaven, and tell the stars, if thou be able to number them: and he said unto him, So shall thy seed be.
Gen 15:6, And he believed in the LORD; and he counted it to him for righteousness.
Abraham believed at the juncture of Genesis 15:6, many years before he offered up Isaac.
When he offered up Isaac, Abraham affirmed his belief that his descendants (through Isaac) would be as the stars in heaven; because Isaac as yet had no progenitors; and Abraham's faith was such that he believed that He would even raise Isaac from the dead. He concluded that this was the only possibility because of God's promise in Genesis 15:5. So, he went through with the sacrifice; only God stopped him in the nick of time and Abraham did in fact receive Isaac back from the dead in a figure.