A decade-long study found a small, consistent negative association between cognitive abilities and religiosity that remained stable over time. The research, contradicting the hypothesis that religiosity might buffer against cognitive impairments in the elderly, has been published in the journal Intelligence.
True or not the study is addressing whether religiosity affects cognitive decline-- slowing it, increasing it, or neither. They found the latter was true.
I wonder if that’s due to the subject being given an excuse not to think for themselves