this might hurt a bit...

...but so does biting the one I love in a moment of passion!!!

I John 4:8.

"He that loveth not knoweth not God; for God is love."

Thats nice you love me, but I just like you as afriend..

This scripture, taken out of context ~ might lead believers and non believers to think it says:

Those that do not know God are incapable of love.

Which really can drive a wedge between those of Christian faith and those of a different belief system.
IMHO.. I do not believe the original text was trying to do that.

In context.. the scripture has a much different meaning.

5 They are of the world: therefore speak they of the world, and the world heareth them.
6 We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.
7 Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
8 He that loveth not knoweth not God; for God is love.
9 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.
10 Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.
11 Beloved, if God so loved us, we ought also to love one another.
12 No man hath seen God at any time. If we love one another, God dwelleth in us, and his love is perfected in us.
13 Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit.

This, to me... means that Christians believe that love is God. It does not mean that in order to love, everyone has to define love the same way Christians do.