What is the ruling on congratulating Christians with the phrase "May you be well every year" on their holidays, with the intention of wishing that they do not harm Muslims in their religion, and not intending to congratulate them on their shirk?

The forbidden aspect of congratulating Christians on their holidays is to show joy, politeness, and approval of their actions, even if only outwardly. This includes giving gifts, verbal congratulations, taking holidays, preparing food, and frequenting amusement places. A

An intention that contradicts the outward expression does not make this act permissible. Imitating them in their holiday rituals is forbidden by scholars; some even went so far as to consider one who does so an apostate, because it glorifies the rituals of disbelief. Umar ibn al-Khattab stipulated to the Christians that they should not display their holidays in Muslim lands. The verse, "And those who do not witness falsehood," has been interpreted to mean the holidays of the disbelievers. It was narrated from the Prophet, peace and blessings be upon him, "Whoever imitates a people is one of them," which indicates the prohibition of imitating them. The majority of imams disliked eating what they slaughtered for their holidays, and forbade assisting them in their holidays by selling or gifting, because it involves glorifying their polytheism and helping them in their disbelief.