Saw this tiktok, divinity of Isa pbuh debated, my thoughts. (religion)

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I honestly don’t understand why Muslims keep debating Western Christians? Christianity is practically dead in the West and it’s rapidly declining. I don’t see why we Muslims prioritize debating with them? Just give generic Dawah and gradually convert the masses and refute whatever arguments they have against Islam or in support of their false religion, other than that ignore them.