Cherry picking (half an interpretation of) one short question from St Matthew's Gospel is not a good way to start a denial of Jesus's divinity. 

Jesus often asked questions to cause insight and growth within a person.   A Jewish interrogative.  American minds aren't very well trained enough to detect and benefit from the technique.  And their souls aren't very well disposed to work through the full meaning and 'end' of that question. 

He's leading people toward the truth, in this case knowledge of His divinity.  And He's not merely handing them an easy answer, but asking for a bit of work and growth to occur. Again, not well suited to today's American.