That there is no soul, there is no god, there is no evidence at all for any of the so called miracles of Jesus, that an angel
, did not come down from heaven, and converse with Mo, etc, etc, etc, etc.
Perfectly sane and rational people can believe in irrational things.
But why is belief in the divine and supernatural, to you, always irrational?
What is your definition of rationality?
If you said that rationality relies on evidence, I would disagree. The word "rational" does not imply the existence or requirement of evidence. The dictionary definition of "rationality" implies that rationality is about reasoning and judgment. Reasoning and judgment do not always involve evidence. Sometimes one must make a decision or judgment without sufficient evidence. In these cases, one must fall back on one's experience and intuition. Decisions made on such a basis cannot be deemed "irrational" just because they do not involve evidence. There is no evidence, yet one must still make a decision.
It is the same here with belief in the supernatural. The people considering such beliefs weigh the pros, cons and possibilities, with little evidence, and their intuition leads them either to believe or disbelieve.
When solving practical problems, yes, one must utilise one's knowledge of science and engineering. In the middle of solving an engineering problem, one does not suddenly cry out to the angels to provide a missing component. That is definitely irrational.
But belief in the supernatural is not a practical issue that requires a practical response or judgment. It is a sentimental issue that requires sentimental thinking.
In the case of the engineering problem, fair judgment involves knowledge of science and engineering. In the case of the supernatural, it requires sentimental thinking. Thinking sentimentally when thinking of the supernatural could be thought of as "fair judgment" because you cannot rule out their existence and you have rightly classified it as one of those things where practical knowledge does not apply.
To me, fair judgment is when one employs practical knowledge to situations that need it. When a person involves fair judgment they are thinking rationally.
It is like what Jesus says, to give to Caesar what is Caesar's and give to God what is God's. Not everything should or must involve practical knowledge. It is a question of appropriateness. Practical issues require employment of practical knowledge. Sentimental issues like belief in the supernatural and divine require sentimental thinking. Thinking with the right concepts for the right situations is fair judgment and therefore rational.
You have to match problems that involve Caesar with Caesar-oriented thinking and problems that involve God with God-oriented thinking. It's a matter of matching the thinking with the issues involved.
One person's judgment and intuition leads them to believe in the supernatural and divine. For another person, it leads them to disbelief.