Funny one-liner. At least it's mathematically correct if each noun (and the adjective "blind") serves as a variable. Ray Charles certainly qualifies in some musical circles as a god. The big problem is that this argument can be used to "prove" contratictory things, like that Ray Charles, Roy Orbison and Stevie Wonder are all God.
"God is love" is used by Christians all along the spectrum, but for different reasons.
- Some fundamentalists and evangelists like Benny Hinn say God is love to establish that God is the only possible source of love, and therefore since love exists, He does too and we need Him.
- Some ultra-liberal Christians and some theologians say God is love as opposed to a bearded man in the sky. It's one way of making the concept of a god so nebulous that it's almost impossible to argue against it. They put God in poorly understood "places", such as emotions or fundamental physical laws, where it's hard to separate Him from what's real and observable. It's a defense mechanism.
- Pretty much everyone who says it is looking to give people the religious ecstasy that often comes from surrendering completely to faith. The phrase is a part of the larger message, "Come to us. Unburden yourself of all your worries and critical thoughts. Relax, let us in and God will take care of you, because from Him all good things come." Once you obey that, for better or worse, you're in the power of whoever told it to you.
"God is love" is a powerful phrase. Probably false in all respects, but powerful nonetheless.