Note - due to the high number of comments I'm getting on this blog post, any comments that avoid any of my questions, use insults, or merely make arbitrary statements will not be posted. (All comments are moderated.)
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.)
Furthermore, in order to complain that God could be deceiving us and this would be bad, you have to first provide an objective basis for morality by which you can call lying morally wrong. The fact that everyone knows that it's wrong to lie and deceive people is because everyone knows God, through whom we have a basis for objectively calling lies morally wrong.
Being aware of the fact that one cannot get certain knowledge without the biblical God, some have argued for absurd parodies that you don't believe in such as 'Thunderfoot' who in a debate with Sye Ten Bruggencate said again and again, "I know things for certain by revelation from 'the ghost that never lies.'"
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)
Here is another well written refutation (by Sean Boatman):
LYING GOD REFUTATION:
NC: You say the God of the Bible reveals things to you such that you can be certain. Correct?C: Correct.
NC: How do you know that this God isn't lying to you about these things you claim he's revealed?
C: Because lying is one of the things He''s revealed certainly that he cannot do.
NC: How has He revealed that?C: Through His Word:
Hebrews 6:18: “It is impossible for God to lie.” Titus 1:2: “In hope of eternal life which God, who cannot lie, promised before time began.”
NC: But if an all powerful God is in fact all powerful, He could be lying to you about THAT, and you would have no way to know it. C: The God of Christianity IS all powerful, therefore it wouldn't be impossible for Him to reveal certainly that He cannot lie and you have no way to object.
NC: You cannot disprove this statement: "when the Christian God said he could not lie, he was lying".C: This statement itself is a contradiction. The Christian God does not lie, nor can he. To say that a non-lying God was lying is a contradiction and a straw man to boot. If the God of Christianity exists and cannot lie, which is exactly what my faith teaches, then it would follow that I have a foundation for truth and knowledge. To argue that this God COULD lie is not to engage with the God of the Christian epistemology but something else. A false god, that I would join you in refuting.
NC: He supposedly told the authors of the bible that he could not lie. But he could have been lying and you'd have no way to know.C: As you reject the Bible as false, what is the absolute standard of truth that you are using to make that determination?
NC: Truth is that which conforms to reality….C: As you say that one could not know that an all powerful deity was lying to you, would it not follow that everything YOU think you know including the nature of reality, your senses, your identity and the validity of your reasoning etc. was in fact all a lie from a lying deity?
NC: I don't believe in a deity of any kind. But as you do, I am saying you cannot know that yours is lying to you.C: How do you know that anything you just typed is itself not a lie from a lying deity? Including the lie that you don't believe in deities of any kind? Be consistent with the dilemma you have created for yourself. According to your own statements you can't know anything to be true as everything you think you know could be false.
NC: But you are in the same situation as I explained above. C: By your own admission everything you think you know could be false, including the claim that we are in the same situation and I thank you for your time. My worldview with the God of Scripture who cannot lie leaves me with a justification for knowledge.
Your worldview which contains the concept of a lying god leaves you with zero justification for knowledge.
This is why the Scriptures teach that "The fear of the Lord is the beginning of knowledge." Proverbs 1:7
"In whom (Christ) are hidden all the treasures of wisdom and knowledge." Col. 2:3
Repent of your sins against the God you know exists and START with Him as your foundation for knowledge, your worldview is reduced to absurdity.