It is the belief which is imaginary(if god does not exist), not the concept which is believed. The concept itself can be derived through rational thought, like many others.
No. It is possible to demonstrate that vast hordes of people, veritably myriad multitudes, "beleive" that 'god' (or a 'god', or "the 'gods' ", and especially
their 'god''), exists. However unfounded, that "bleif" is not imaginary. It is, instead, the multiply exclusive
objects of that belief, that have been invented to justify the belief itself. The "concept" itself is a back-formation.
And by the way, in four years of posting on this site, I have not seen one piece of evidence suggesting that God/god does not exist. Although I have seen lots of references to scientific understanding of physical matter dressed up as some kind of relevant evidence.
I wondered how long iit would take for you to slip in the requisite attempt to invert the
onus probandi. It is not up to "science" to "disprove" the existence of what the credulous want to call 'god'. It is up to the ones claiming the existence of a 'god' (or
any 'gods') to provide evidentiary support for their claims.
If, and only if, actual evidence (practical, empirical, testable, non-anecdotal, physical evidence of any of the multiple thousands of 'gods' which have been invented, imagined to exist, is presented; at that point it would be the proper purview of "science" to test, assess, and attempt to falsify that evidence (as with the "evidence" for Nessie, or Champy, or 'Squatch, or Nicolas Van Rijn, or any other imagined entity).