1)
What is the question "how will Hashem know"?
1.
Rashi: How can we save that Hashem had knowledge, and His Torah is Emes?
2.
Radak: Hashem is Kel Emunah. How can it be that Hashem knows people's ways, and He does evil to those who go in His ways, and benefits those who deny him and Resha'im?! Malbim - this shows that He does not know what happens in this lowly world.
