There are two commonly cited verses used to justify Fideism (faith is belief without or against evidence). These are Hebrews 11:1 and John 20:29.
Hebrews first, let’s look at some parts of the rest of the chapter. I recommend reading through the whole chapter (and indeed the whole book) to understand the context of Hebrews 11:1.
By faith Noah, when warned about things not yet seen, in holy fear built an ark to save his family. By his faith he condemned the world and became heir of the righteousness that is in keeping with faith.
Did Noah believe without evidence? Not really, God literally spoke to him, he heard the voice of God. What was it that he had faith in? He had faith in the promises of God, that what God said would happen would happen. And it did, God did flood the world. In other words, Noah trusted God.
By faith Abraham, when called to go to a place he would later receive as his inheritance, obeyed and went, even though he did not know where he was going.
Did Abraham believe without evidence? No, God spoke to him and made promises to him. Abraham trusted in God’s promises, trusted that God would do what He said. And He did. This was his faith.
And by faith even Sarah, who was past childbearing age, was enabled to bear children because she considered him faithful who had made the promise.
What was Sarah’s faith? Considering God faithful when He made a promise. Again, faith is trusting in the promises of God.
By faith the people passed through the Red Sea as on dry land; but when the Egyptians tried to do so, they were drowned.
Why is this faith? Because they trusted the promises of God, that God would keep them safe and deliver them to the promised land.
The chapter gives many more examples, and in vs 13-16 makes it clear that faith is trusting in the promises of God. Specifically, the promise of eternal life. That we will come to live in our own promised land, taken out of where we were, like Abraham and Moses.
So faith is not being confident in something we have no evidence for. Faith is trusting in the promises of God, trusting that God will do what He says He will do.
What then is it that we hope for that we do not see, as per verse 1? It is eternal life. Abraham, when he trusted God, hoped for the new land he was going to be given. He didn’t see it, but he hoped for it and was assured of it, because God promised it to him. The same is true of Moses. The same is true of Sarah and her child. But it is not reasonable to say that none of these people had evidence, they all had direct conversations with God, where He promised these things. A promise from God is strong evidence.
What then of Jesus’ words? “Blessed are those that have not seen, and believe”? It doesn’t clearly say that believing with no evidence = blessed, like many claim. In fact it seems that the meaning is quite different. The verse is a resurrection appearance of Jesus. In every other resurrection appearance, Jesus is commanding the disciples to go and tell others.
This starts in 20:17, where Jesus commands Mary to tell the other disciples.
Then in 20:21 in another appearance, where Jesus sends the disciples out.
Then 20:29, the passage we are discussing.
Then all of chapter 21, in which the net full of fish that the disciple catch represents them being made “fishers of men” as Matthew calls it, it represents the fruits of their evangelism.
Every other resurrection appearance in John has a focus on evangelism, and spreading the Gospel that they know to other people.
So when Jesus tells the disciples “Blessed are those that have not seen and yet believed”, it seems reasonable to expect this to follow the same pattern. It seems more reasonable to interpret this as “There will be others who have not seen me, who are not of us now, who will come to believe and be blessed”, or something along those lines. It’s reminding the disciples that they are not the only people that God has planned to receive.
Furthermore, Jesus desiring belief without evidence is contradicted by John 14:11, where Jesus expects His disciples to believe He is one with God because of the miracles that Jesus has performed. He expects the miracles to be evidence for this belief. If Jesus wanted belief without evidence why would He say this?
So the commonly cited verses do not support Fideism, and there is scriptural evidence against it.