You are what you eat. That is as true of the mind as of the body.
Eat enough greasy food, and your silhouette will betray your culinary preferences. Give credence to enough greasy ideas, and your mind will be as flabby as your waistline.
This book looks at eight examples of religious junk food, things that have come across my desk during my career as a Catholic apologist. You likely will find these morsels unconvincing and unpalatable, as you should. The problem is that plenty of people--including people on your block--consider such stuff to be intellectual high cuisine.