I’ve often heard from atheists that “claims made without evidence can be dismissed without evidence”. And while it’s become an annoying refrain in the religious/secular conversation, there is a certain logic to it.
But here’s the thing: atheism, by definition, cannot have evidence. Atheism is a positive claim about the non-existence of God (or gods). And there cannot be positive evidence that proves the non-existence of a spiritual being.
Now, I can’t speak with great authority on all religions, but I’m pretty familiar with Christianity, so I’ll limit my comments to that. Christianity is based on evidence: this includes miracles that were performed and prophecies that were fulfilled by Jesus. In particular, the key evidence that the Christian faith hinges on is the resurrection of Jesus after his death by crucifixion. Indeed, the holy scriptures of Christianity claim that if this historic event did not occur, then the Christian faith is futile and meaningless. Of course, this event took place only once, at a single point in history, nearly 2000 years ago. So we can’t use personal observation of it as our own evidence: instead, we look at the eyewitness testimonies of the people who were there and recorded what they saw.
There is other evidence for Christianity, because Jesus also taught that we would be able to interact with God in the Holy Spirit. This interaction is a personal spiritual experience, and as such it’s not going to convince a third party of anything. But it is strong evidence for the individual who experiences it.
Now, you may not find this evidence convincing. Particularly when it is stacked against an extraordinary claim, that Jesus was and is God, the one who created the universe, you may find that the evidence is insufficient for you to believe that claim.
That’s your call. But the logical conclusion to that process must be: “I am unconvinced by the evidence for the existence of God”. That is a position called agnosticism. It’s an honest and intellectually defensible response to a lack of convincing evidence. But it’s not atheism.
Atheism is a position of completely blind faith. It is a belief, not just in the absence of evidence, but without even the possibility of evidence. It is a completely irrational faith.