In support of Descartes' epistemology, Lex Newman advances the 'Non-atheistic-knowledge-thesis', i.e., indefeasible knowledge cannot be gained unless the existence of God is proved. Here I expound the `non-atheistic-thesis-of-Cartesian-metaphysics', which, unlike Newman's, refers to how four Cartesian metaphysical conclusions require the existence of God. To test whether such conclusions need divine existence, we may ask what would happen if God did not play any decisive role in the Meditations. As I argue, four unpalatable consequences would follow for Cartesian metaphysics, which would ruin Descartes' plan to refute the skeptic and the atheist alike.