Thus, the address is either broad, embracing both the idol-worshippers and the People of the Scripture, or it is directed specifically to the idol-worshippers. As for the People of the Scripture—the Jews and the Christians—in either case there is no reason whatsoever to single out the Christians alone.

Concerning the Exalted One’s words,
“There is no argument between us and you.” ⦗Ash-Shura 15⦘
this is similar to His statement:
“Say, ‘Do you dispute with us about Allah while He is our Lord and your Lord? Our deeds are ours and your deeds are yours, and to Him we are devoted.’” ⦗Al-Baqarah 139⦘
and to His words:
“So if they argue with you, say, ‘I have submitted my whole being to Allah, and so have those who follow me.’ Then say to those who were given the Scripture and to the unlettered, ‘Have you submitted?’ If they submit, they are rightly guided; but if they turn away, your duty is only to convey the message.” ⦗Āl-ʿImrān 20⦘

The term ḥujjah (argument) applies to whatever is put forward as evidence, whether true or false, as in His saying:
“so that people will have no argument against you—except those among them who do wrong.” ⦗Al-Baqarah 150⦘
For the wrongdoers present a specious argument against you, just as the idolaters did when the prayer-direction was changed to the Kaʿbah, saying, “He has gone back to your qiblah; soon he will return to your religion.”