If God has mathematics of his own that needs to be done, let him do it himself. [Errett Bishop: "Foundations of constructive analysis", McGraw-Hill, New York, (1967) Introduction]
Can He have a list of all real numbers? If not, can He store the real numbers in His Infinite Eternity or Eternal Infinity? - each number pinned down by a rational space-time-quadruple? - or quintuple or even centuple? If so, then He could also compute 2 + 2 = 8 and he could conclude that Cantor was right. It does not seem that He has mathematics of His own.