My dad moved a while back, and while cleaning out the closet, he found a pill. The word "God" engraved on it. The pill had a bluish/grayish color. What could this be?

Take it to a pharmacist to see if he/she knows or can look it up for you.

i'd be tempted to swallow that one

LOL

This turned up ZERO

https://pillbox.nlm.nih.gov/pillimage...&submit=Search

So my guess is ecstasy or some other illegal one.