Being a "fool for God" doesn't mean someone has a feeble mind, or has "blind faith." The phrase is used to acknowledge that our wisdom is very small in relation to God. If you don't believe in God of course, it just sounds stupid. If you do believe in God, it's a good reminder that we are of limited vision and on our own can screw up our lives royally. It doesn't take a lot of reflection to remember how many times our own "wisdom" and intellect has caused us to make a mess out of our lives.
But, this isn't a spiritual forum. Besides, it's too easy to express poorly what we believe in a public forum. No offense meant to anyone.
Jerry