Evil is evidence for God

[Zen Badger]

I have heard the following argument used for the existence of God. Since I doubt anyone will say that the actions of Ted Bundy and Jeffrey Dahmer are not truly evil then I say the following makes a good argument. What are your opinions?

1. If God does not exist, objective moral values do not exist.
2.Evil Exists.
3.Therefore, objective moral values exist (some things are truly evil).
4.Therefore, God exists.

Invalid argument.....

Morals are purely subjective.

Whilst no-one here would suggest that the actions of Bundy or Dahmer were good, what is the difference between that and the Sharia law stoning of women merely suspected of adultery.

Said stoning being considered very moral in those countries where Sharia law applies.