Why could Descartes not appeal to Aquinas arguments for the existence of God?

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Descartes sought to establish a foundation of knowledge that did not rely on any assumptions about the external world. Aquinas' arguments for the existence of God relied on observation and explanation of things in the world, making it difficult for Descartes to use them in his project. Descartes had adopted a method of doubt that called into question all beliefs that were based on sensory experiences. Aquinas' arguments for the existence of God relied on observations and claims about the external world, which Descartes found to be uncertain. Therefore, he could not appeal to them as a basis for his own arguments in favor of the existence of God.

Why Could Descartes Not Appeal to Aquinas Arguments for the Existence