One’s faith can be put on a spectrum. Abraham’s faith was higher on the scale than Thomas’. More evidence produces a deeper faith usually but one has to believe the evidence is real before that will happen. Abrahams faith very high on the scale. Thomas’ faith was lower. It’s not that one either has it or doesn’t. It’s how strongly they believe.
When Abraham was commanded to offer up Issac as a sacrifice, what was Abraham's evidence that God would make good on his covenant promises to him re his Son Issac in spite of such a command?