Lately a common argument of professed unbelievers I've been hearing has been the argument that God cannot be trusted because he could be deceiving, misleading, or blatantly lying to us. However, this argument is nothing new and is as old as Satan himself who in the garden of Eden asked Eve if God had really said what she thought he'd said. ("Did God really say...?" Gen 3:1). Satan was implying that God wasn't really telling them the truth but was lying to them. As Ken Ham has said, "What greater lie can there be than 'God's word is not true'?
When people put forward the 'deceptive God argument' they are not talking about the God of the Bible which clearly says that God cannot lie. (Hebrews 6:18). There are other less clear verses in the Bible that are challenging to interpret properly, but usually atheists aren't interested in understanding verses properly, but are more interested in twisting the Scriptures to advance their own agenda to misrepresent the true character of God.
For a really good article that deals with the difficult verses in the Bible used by skeptics to support their deceptive God argument see here - http://christianthinktank.com/godlies.html.
The biggest issue though is that the deceptive God argument is self-refuting. If God could lie then there would be no way we could trust any rationality, as everything could just be part of a deceptive illusion made up by God. So the deceptive God argument cannot be true, because if it were true nothing could be true - the argument is self-refuting and destroys itself, along with the possibility of knowing anything.
Another reason why the deceptive God argument is self-refuting is that God is the only true foundation for the absolute law of non-contradiction (LNC). If you wish to discuss any supposed Bible contradictions (such as the alleged contradiction between verses which say God cannot lie, and other verses which the skeptic alleges are saying God can lie) then first you'll have to account for the absolute LNC - but without God it's not possible to account for this law of logic. (Many professed atheists will deny that the LNC is absolute, because an absolute law brings them too close to the God of the Bible from whom laws of logic flow.)
In conclusion, the proof that God exists (and cannot lie) is that without Him you couldn't prove anything. This is because the concept of proof presupposes knowledge, logic, and truth - and you can't get those without Him. (See my website www.godorabsurdity.com)
Atheists Stupid Statements #6