If the non-deceiving nature of God must be established to escape radical doubt, then 'God cannot deceive' is doing epistemic work that cannot itself be grounded without circularity, as Arnauld's Cartesian Circle objection shows.

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Antoine Arnauld(as referenced in the objection to Descartes): A 17th-century French philosopher and theologian who pointed out a logical flaw in Descartes's argument about God and knowledge.
Cartesian Circle(Arnauld's objection to Descartes in the Meditations): The alleged circularity in Descartes's argument whereby the reliability of reason is used to prove God's existence, while God's existence is required to guarantee the reliability of reason
Circularity (in reasoning)(as the potential problem that Goodman addresses): A logical problem where your reasoning loops back on itself—for example, using a conclusion to prove the rule that created that conclusion, which creates no real progress in justification.
Epistemology / Epistemic(as in 'epistemic justification'): The study of knowledge—what it is, how we get it, and what makes something count as true knowledge rather than just guessing.

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