We have to stop making statements like that because they are delimiting and they discourage pondering about other possibilities and probabilities. God is quite capable of creating circles that don't conform to p as we know it.
Mathematics is a notational representation of human logic, flawed and otherwise. The notation is man-made and is figuratively and literally Greek to most people. Math has evolved and will continue to do so, and is a long way from being perfect, IMO
Your response is bewildering to me, for if God (who can do anything) were to make a circle where pi is not the ratio of the circumference to its diameter, unless He also changed our memories - it wouldnt be part of the "circle" set. The mathematicians would be challenged to find the properties of the new set.
But you sell Mathematics short, IMHO. Of all the disciplines, it is the most rigorous.