@CoteDAzur
"I'd say most scientists know love, and nobody calls them irrational for doing so"
Love is fairly well understood in terms of evolutionary pressures and chemistry, much like Pain. There is ample evidence for its existence, symptoms, and the pituitary hormones that are released in its creation.
Knowing love and understanding that other animals also feel it after at least a century of scientific experiments has nothing to do with believing in an invisible deity without a shred of independent evidence.
Well, that's it, isn't it. Your definition of God as a deity. I spoke of a higher power, which I also believe in, not a "deity".
A "something" that can be felt internally, but never proven. Just as love cannot be proven. Not some entity up in the sky.
Just as there is basically consensus as to what the feeling of "love" entails, you'd find that there is basic consensus among people of all religions what that feeling of connection to a higher power is: deep awe, love, peace, comfort, strength that comes from within. Leave deities out of it and you'll have a better understanding. Yes, it is internal, subjective, and yes it can't be proven. But its effects upon the human psyche can most certainly be measured. Just like love. There is, in fact, no difference.
But isn't it amazing that, when it comes to the crunch, people of all religions and of a less religious, more spiritual approach, do find a common denominator in what their faith actually FEELS like? And that that sense in no way contradicts physical reality and scientific facts, in fact, that the two go very well together?