Commentaire sur L’Exode 34:14

קנא שמו WHOSE NAME IS קנא — Who is zealous (מקנא) to exact punishment from the sinners and is not indulgent towards idolatry. This (the above) is always the meaning of the root קנא wherever it is used in connection with God. Consequently קנא שמו His name (His characteristic) is קַנָּא that of a zealot, implies: He maintains (insists upon) his superiority over other gods, and punishes His enemies (those who worship idols).

כי לא תשתחוה לאל אחר, this is why you must destroy altars intended for worship of such alien deities and not display any indulgence to people practicing such a religion. By indulging such people [in the name of ‘freedom of religion’ Ed.] you would be honouring such deities indirectly and you would provoke My wrath for

כי ה' קנא שמו, G’d’s very name suggests that He cannot tolerate any other existence in the universe that purports to be independent of Him, in competition with Him. This is why He is known (in the Ten Commandments) as “a jealous G’d.” This means that He will punish those who serve the “competition.”