There are no kafirs in hindusim that is an islamic term.
Krishna doesnt hate the nonbeleivers or threaten to punish them.
Obviously u havent read the Bhagavadgita.
What happens to nonbeleivers(in krishna)? here it is in Bhagavadgita:
BG 7.21: I am in everyone's heart as the Supersoul. As soon as one desires to worship some demigod, I make his faith steady so that he can devote himself to that particular deity.
BG 7.22: Endowed with such a faith, he endeavors to worship a particular demigod and obtains his desires. But in actuality these benefits are bestowed by Me alone.
Krishna is saying (above) that he benefits people who worship demigods.
But who aspairs to reach godhead will worship him alone.
BG 5.29: A person in full consciousness of Me, knowing Me to be the ultimate beneficiary of all sacrifices and austerities, the Supreme Lord of all planets and demigods, and the benefactor and well-wisher of all living entities, attains peace from the pangs of material miseries.
See, no jealousy, no vengeance .No threats of torture in hell.