this came up in an online duel and I wanna know from a judge, Does attacking Target? I mean, if my opponent proposes an attack and I respond with Divine shield, does it mean he can't target me anymore?

This is what we call an edit to flip my answer completely
That is not quite correct. Here's how that stage of combat works:
Attacking does not specifically 'target' the defender, you merely 'choose' (it's different)
Your "Divine Shield" would still stop all the damage dealt this turn, however.
So, to space it out it would look like this:
It is your opponent's Action Phase, so they have priority when the priority window opens. Your opponent adds a combat proposal to the chain, choosing their ally and your hero, then passes priority to you.
You respond by adding "Divine Shield" to the chain. You pass priority, and your opponent passes as well, so "Divine Shield" resolves, and your hero becomes untargetable and undamageable. (are those words? lol)
The combat step begins, and the proposed attacker exhausts. Assuming all players pass on priority and no more links are added to the chain, the ally 'attemps' to deal combat damage to your hero, but the damage is prevented (in the exact same way that you would prevent damage with a piece of armor)

Hope this helps!

Please note that my original post was incorrect, and Zio helped me to correct it (I want to give credit where credit is due)

Combat proposal does not target. He merely chooses. So, Divine Shield won't stop him from proposing an attack on your hero. Your hero however, won't be taking any damage since Divine Shield prevents all damage that would be dealt to your hero this turn.

edit: slednecker posted before me but it would seem that he went with the idea that combat proposal requires targeting.

I know VS System and WoW is quite a different game but based on VS System, there is no targeting unless the rules/card text specifically uses the word "target".

Wow I didn't even catch that! I'm so embarassed )= well done there, zio! Thanks for the backup lol I'll go ahead and edit my post so peeps don't get confused like I did

Heh, no worries. Its a new game and all of us are still learning. Although I do believe that there more rules expert in here than questions. :P

I can't even answer a question first these days. I must be typing real slow :P

Well my opponent was attacking with the anhilator, so he did damage through it. That kinda sucks for me as a pally user. If an opponent has a way to do unpreventable damage, divine shield is essetially useless. Thnx for the help.