The Rambam takes a different view than Rav Yehuda Halevi regarding the miracles of Egypt. He felt that in time, the great miracles of the Exodus could be minimized and viewed as acts of nature.
We see this prediction of the Rambam as containing some truth. Many theories regarding the splitting of the Red Sea have emerged over the years. Similarly, even the Ten Plagues are seen by some as coincidences and freaks of nature.
Therefore, the Rambam felt that it is much stronger to come to the knowledge of Hashem by way of the intellect. A person needs to use his mind to figure out why the existence of G-d makes sense. And that the most worthwhile endeavor one can do, is serve G-d with all his heart, soul, and might.