They congratulate me, so how can I not congratulate them?!

Some people ask: My colleague at work or my neighbor is Christian, and he is kind to me and congratulates me on Eid al-Fitr and Eid al-Adha. Is it reasonable that I do not congratulate him on his holiday? So we say, brothers: 1) When reading the Quran, we find many verses that explain the difference between Islam, polytheism, and disbelief, to the extent that I think this concept (they are not equal) is the most dense and focused concept in the Quran after the concept of monotheism, and there is no wonder, for it is the first fruit of faith in monotheism. Therefore, brothers, it is not correct to say: As he flatters me in my religion, I should flatter him in his religion, for the two religions are not equal. And it is not correct to say: As I see my religion as true, he sees his religion as true. Otherwise, on this logic, Jews, Buddhists, and cow worshippers also see their religion as true! It is not appropriate for our concern to be how we flatter our non-Muslim colleagues and neighbors and get rid of embarrassment when our eyes meet theirs before their holidays, but rather our concern should be how to save them from what they are in, which is polytheism that will ruin their afterlife. Did he treat you well and be kind to you? Then the best way to repay him for his kindness is to invite him to the religion of God to save him from the fire. This is the real kindness, while rudeness and harshness is to let the days and years pass and leave him to ruin while you have the guidance he needs. And let those who object to this speech know that I have students, colleagues, and Christian acquaintances, and my relationship with them is very good despite not flattering them on their religion, a relationship based on justice, goodness, and concern for their benefit in this world and the next. I have taught dozens of Christian students so far, who show me respect and appreciation even after graduation. And I hope that any student who has graduated and has a different opinion than what we say will clarify it here, if we have wronged or hurt them in dealing with them. 2) The Prophet (peace be upon him) and his companions (may Allah be pleased with them) and the followers...they associated with Christians and Jews and lived with them for many years. And yet, no authentic or weak hadith was narrated that the Messenger of Allah or a companion or a follower congratulated a Jew or a Christian on their holiday. Rather, we know that the Prophet (peace be upon him) invited the Jewish boy who served him to Islam before his death, and he left him saying: ((Praise be to Allah who saved him from the fire through me)). And he did not flatter the boy and congratulate him on his holiday! 3) Participating with non-Muslims in their social occasions, such as condoling them and comforting them in their misfortunes and congratulating them...all of this is permissible to do with legally regulated words, and it has no relation at all to congratulating them on their holidays related to their religions. 4) O you who strive to defend congratulating Christians on their holidays, how many times have you invited your Christian colleagues or neighbors to Islam? How many times have you tried to save them from the fire? And does it make sense to invite them to the religion of God during the days of the year, then congratulate them on their holiday, which is one of the rituals of their religion that you invite them to leave? 5) Imam Ibn al-Qayyim - and he was one of the most gentle-hearted people and the most eager for the guidance of humanity, as we consider - said in his book (Aḥkām Ahl al-Dhimmah): (As for congratulating them on the rituals of disbelief specific to them, it is forbidden by consensus, such as congratulating them on their holidays by saying: May your holiday be blessed. Or congratulations on this holiday. If the speaker is free from disbelief, this is one of the forbidden things, and it is like congratulating him on prostrating to the cross, but that is a greater sin with Allah and more despised than congratulating him on drinking alcohol, killing the soul, committing fornication, and the like ... Whoever congratulates a servant for a sin, innovation, or disbelief, has exposed himself to the hatred and wrath of Allah).