Are you perhaps thinking of the secularist argument or atheist argument that religion only arose because man needed a god, and so created god in his own image, in a variety of ways throughout history?
That sort of thing may have happened, but going back as far as Plato and Aristotle, mankind has also shown an ability to think about such supernatural matters in an intelligent way, separate from our own human preferences. (Indeed, when it comes to good philosophical thinking, in many cases the ancients were much better at it than the moderns.)
Reading some books by Peter Kreeft or Frank Sheed is recommended for a good philosophical underpinning on how to think about God.
In fact, Mortimer Adler wrote a pretty good book with that very title: How To Think About God.
Adler, Kreeft, Sheed, oh sure, even Karl Keating–all these writers help to dispel some of the mushy thinking that passes for philosophy nowadays.