Perhaps because the arguments for or against any God existing are not really that clear-cut (unless already a believer) but where the evidence tends to side against God - if one looks at the spread of evidence, and which does tend to involve so many spheres of knowledge - even as to knowledge of oneself. And which then might outweigh any emotional feelings as to such?
Only? Well, quite easy, if one has the courage to question and seek out that which might produce such a result. Do some simply assume that the God belief is the default position - especially if felt - and that therefore every parent has the right to instill this into their children as a right, but which is simply a bias being passed on. Perhaps we should ask, firstly - does a god make sense? Any toddler should be able to answer this satisfactorily.
Even if you don't believe that an emotional connection to God might be delusional I'm afraid that is not my belief. There are plenty of such experiences that involve no God or gods, so why attach any particular one experience to such?