How do we understand al-Quran?
The answer is we understand each al-Quran verse by looking for explanation from one another al-Quran verse.
Non-Muslim can't use "Allah" name and it's against freedom of speech?
The answer already given by Allah The Glorified and the Exalted in al-Quran more than 1400 years ago before Malaysian debate this issue.
First of all, Allah s.w.t. already explain about Himself that none of the creation is looks like Him. As stated clearly in al-Quran, Surat Al-'Ikhlāş (The Sincerity) :
Say, "He is Allah , [who is] One, Allah , the Eternal Refuge. He neither begets nor is born, Nor is there to Him any equivalent."The exclusiveness of "Allah" name?
Those people at the prophet time already argue about the name of god, when they being asked who is their god? They immediately said "Allah", but then they worship hundred idols that placed around Kaabah. Clearly contradicts what the real meaning of "Allah" which mean "One God". As stated in al-Quran:
And if you asked them, "Who created the heavens and earth?" they would surely say, " Allah ." Say, "[All] praise is [due] to Allah "; but most of them do not know.
(Surat Luqmān (Luqman) 31:25)Allah s.w.t. more than just a name to behold. Allah s.w.t. isn't idolatry to be worshiped. This is clearly stated in al-Quran for servant's mindset that when they asked who is the Creator of Universe? They answer "Allah". But then, at the same time they praise to the idolatry for the faulty they made although they claim god is Allah.
This is pointless to say which religion have the right to use "Allah" in Torah or Bible. Everyone has the right to talk about "Allah", and most importantly we are not talking about "Name", we are talking about the "Awareness" of knowing who is our Creator (Surat Al-'Ikhlāş ).