They have certainly disbelieved who say, " Allah is the Messiah, the son of Mary" while the Messiah has said, "O Children of Israel, worship Allah , my Lord and your Lord." Indeed, he who associates others with Allah - Allah has forbidden him Paradise, and his refuge is the Fire. And there are not for the wrongdoers any helpers.
They have certainly disbelieved who say, " Allah is the third of three." And there is no god except one God. And if they do not desist from what they are saying, there will surely afflict the disbelievers among them a painful punishment.
Surah Al-Maidah.....Al Quran 5.72-73
Say, "He is Allah , [who is] One, Allah , the Eternal Refuge, He neither begets nor is born, Nor is there to Him any equivalent."
Surah Al -Ikhlas.....Al Quran 112:1-4
Of course Islam rejects trinity, and divinity of Jesus (Isa), as stated above....
...but I did not see a verse in Quran saying that we Muslims must prevent others using the name Allah.
And we Muslims, are NOT, I repeat, NOT in any circumstances, even in wars, I repeat, EVEN IN WARS, to attack any religion's worship buildings. We are instead required to PROTECT, NOT ATTACKING them. Those who do the contrary, has broken the law, be it civil law, or Islamic law......
Plus, in East Malaysia, church services are conducted in Malay. Me, a Melanau by ethnic, have many first cousins and friends who are Christian, be they Catholic, Methodist, SIB, or such.....they, for a very long time, used the term Allah!
There is no single word in Melanau language, and perhaps other Bumiputera language as well, that could translate "Allah", or "Tuhan", or "God", or even "Dewa" properly.
Say, Melanau.....Ipok? That's "semangat" in Malay.
Iban.......Betara? More like Malay "dewa".
Even Tuhan will not suffice. Why? Because they are used to the word Allah, and substituting it with 'Tuhan' will be downright awkward.
And these "No Allah for Non-Muslims" say that Muslim aqidah (faith) will be confused.
I wonder, whose faith will be confused.
Muslims who understand their religion properly....or those who don't?
This "confusing Muslims" excuse, are just an excuse to close Muslims' eyes towards the neglect of mualafs (Muslim new converts), the loopholes and weak parts in Pendidikan Islam education systems, errors in our Muslim authority systems and our "state religion" concept itself!
For me, as a Muslim, rather than wasting time and effort to prevent Christians or any other religion from using "Allah", we the Muslim as a whole must strengthen the Islamic education. Strengthen our faith, and it won't sway so easily.....