Does the failure to grasp the concept of God's existence and His creation of us indicate a lack of faith in Him?

If the intended meaning of "lack of comprehension" is not understanding the how of God's attributes, then this is natural, because no one knows the how of God's attributes except Him, the Exalted. His attributes are transcendent above resembling the attributes of created beings, for "There is nothing like unto Him." And whatever comes to mind regarding the how of His attributes, God is contrary to it. God has made minds despair of knowing the true nature of His essence and attributes, as He said: "And there is none comparable to Him," and "while they encompass Him not in knowledge." It is recommended to ponder God's blessings and His wondrous creation, for it increases faith in Him.