If god can't lie, does that mean he can't do everything?

[Angrboda]

Well, a passage from Proverbs comes to mind, where the Bible is listing things that God hates (how an all-good God could be capable of hatred is another topic). One of these is liars.

So if God hates liars, then if God were to lie, he would hate himself. If someone hates God, the Bible is pretty clear that they’ll be eternally damned. 

Boru

I'm not saying God would lie, but the claim was that He couldn't.  I'm saying He could if He wanted.

Two things prevent this. First, God is morally perfect. It's his nature. He can't do something that is not in his nature, which lying would be. The second has to do with omniscience and free will, but I doubt a believer would accept that God has no free will, no matter what evidence is presented.