Well, we all are delusional in some aspect.
Many religious people want to feel like things will be OK when they die, want to feel like someone much bigger and stronger is looking out for them (the Bible says the opposite, but most people don't read it).

It's like the Christine Baranski quote in Bowfinger, "I think it was a beautiful lie.."

I consider humans as a species delusional

Yes, absolutely, Who could possibly think otherwise ? the following contributions are far better than I could offer.

Yes

Completely!

That would be affirmative.

That would be affirmative.

Of course

No amount of consideration on my part is going to change the delusional thought process of a religious person. The comfort achieved by rationalization is difficult to overcome. When a person devotes themselves to the mantra, "It's God's plan," they have divorced themselves from responsibility and, by default, the consequences of they're action. They suffer, because the brought it on themselves. Of course, this does not apply to the pretenders, like 45 and his ilk.

yeah

Depends on why they are religious? I know people who are "religious" because going to church is something that they've always done and it's how they learned to socialize. Being in those circles and socializing with familiar trappings helps them deal with the world. They are happy that the really complicated questions about reality can be put in a book so that they can go on with the daily mistrations of living in our world. It's easy because nothing really complicated has happened, nor have they experienced any hardships in their lives, to make them question what they get from their beliefs. I would say these people are not delusional.

I also know people who are religious because they strongly believe in the reality of their god, and the belief that their god actually interacts with them personally and with others in their lives. That their god does things for them personally based on a belief, prayer or offering of some sort despite the fact that there is no real evidence to support it. To me, that's delusional.

So, I find most religious people to be someplace on a spectrum of the non-delusional to the delusional and their position constantly moves based on what's going on in their lives in the present.

Finally, I find that the delusion, at least AFAIC, to be more related to their belief in a god than their tie to a religious organization.

Some certainly are, but many are just going with what they've been taught and have been given no reason to question it.

Delusional people can be one's who think there are ghosts out there. If you think there are religious people and ghosts then they are one in the same.

No. I consider them going through a developmental stage.

Yup.

Yes and no. Yes in that they believe in a non-existent creature or creatures. No, in that thye didn't invent those creatures, they've been brainwashed into believng in them. It's like Son of sam. He was delusional, in that he thought his dog was telling him who to kill. If his society had been,for generations, telling themselves that dogs run things, he'd merely be devoted.

In one word...yes.

define delusional ?
one's delusional is the other's delusional

I consider them weak.

Yes, they are delusional only in religion.

No. They have a belief system. One which has stood in the face of scientific and technological progress.

Religion is based on fear and delusional in that sense. Most people here were once went along with Religion, are they delusional, ? Labels is such a wide brush.

yes but would never tell them that

I think that there are some who are delusional. Others have had religion so embedded in their thought processes that they don't know any better. I used to be like that. The embedded one, not the delusional one.

I do but with the caveat that I think most people are religious by default. They don't really question it; so much as they just go along for convenience.