The rational response to having no objective evidence, or sound reasoning, for something is to not accept the proposition that it is true, which, in this case, leads directly to agnostic atheism.
Not sure what point you're making here. If you believe that people can choose their beliefs, do you have any objective evidence or sound reasoning for that belief?
The number of people who belief is irrelevant and it's not as if people who say they believe in 'God' all believe in anything like the same thing. In the case of Christianity, for example, you could hardly argue that Desmond Tutu and the members of the Westboro Baptist Church believe in the same being. And that's before we get to differences between religions.
It's not irrelevant to the point I made, which is that it is observable that people believe in the existence of something for which there is no objective evidence, and there is no method to test for its existence. The variation in their beliefs is probably because the experience and interpretation of their belief is subjective so it will reflect their nature/ nurture.
Whereas I'm sure that this is true for some (many, perhaps, I don't have any statistics, do you?) there seem to be no shortage of believers that think that there is objective evidence and/or sound reasoning that leads to their god. We have two examples on this thread recently.
Sure but they have yet to produce any objective evidence and only offer subjective evidence such as stories from witnesses who have subjectively interpreted what they experience. So regardless of what they think, the evidence we see them offer is subjective evidence.
On one level, the negatives of religion are pretty much the same as any other type of tribalism. However, in the case of the more extreme fundamentalist varieties of religion there seems to me to be a level of magical thinking and a disconnection with reality that means that they don't feel the need to even try to justify themselves with respect to reality at all. This seems to be a significant difference.
Do you have a link I can read to studies showing evidence of a different level of magical thinking linked to 'tribal' religious identity (as opposed to 'tribal' political identity or ethnic/cultural/ moral identity) that is shown to cause an extra or different level of violence in people? I don't know if there are such studies or is this something you believe to be true but don't have any objective evidence or sound reasoning to demonstrate?
Presumably there isn't a problem in a democracy with people holding or arguing for differing beliefs including beliefs about something existing, given the alternative is some sort of a dictatorship?
The problematic issue seems to be with people who believe in the absolute truth of their particular belief AND also believe it is not acceptable to deviate from the norms of behaviour/thought that they hold to be true AND are willing to commit violence to force others to not deviate or to accept their belief is true - presumably because they also believe the end justifies the means.
For example people who believed in the absolute truth of Brexit without any objective evidence - e.g. that it would secure UK borders or would not negatively impact growth or lead to wage and price inflation, or believed a hit to the economy was a price worth paying to leave the EU or believed in Boris Johnson's political slogan that he will "Get Brexit done" only become an unacceptable problem for society if they start murdering MPs or inflicting violence on those who oppose Brexit.
Another example is that it might be acceptable if people believe in the absolute truth of their proposition that gender exists or is more important than biological sex or that biological sex is assigned at birth or that biological sex is on a spectrum rather than binary or that a person can be born in the wrong body or that you can change your biological sex. Whereas if some of those believers go on to become activists in order to change social norms OR a minority of them go on to believe that opposing views e.g. gender-critical beliefs inflict violence on transgender people AND therefore it is ok to use violence to force others to accept and live by their trans-activist belief, it becomes problematic for society.
Whether someone adopts an extreme position based on their beliefs seems to be a function of how much a person's identity is tied up with the belief, which may be a result of their nature/nurture. Increasingly studies seem to link teenage adoption of a trans identity in girls with neurodivergences such as autism.
We can observe in the LGBTQ community that there is frequent in-fighting amongst people who broadly share this particular group identity, with frequent attempts to influence wider society to cancel people or reject people for deviating from the ideology that a minority of vocal activists deem to be the absolute truth.
So not really seeing evidence of a unique level of magical thinking applicable only to religious belief.
Rationality?
Again, not sure of your point - unless you are suggesting people can choose their beliefs?