God and Allah are not the same in English.They are not interchangeable.They are two different entities. Gods name should be used, Allah denotes something entirely different in this country.
The issue is in regards to the Arabic language not English.
A literal translation of the Pledge of Allegience into Arabic will include the word "Allah" because in Arabic "Allah" is the ONLY word used for God. That is not rocket science.
Arabic Christians use the word "Allah" when they refer to the God of the Bible. Spanish Christians use the term "Dios" when they refer to the God of the Bible. It is a language issue and we ought not be ignorant of that fact.
To demonise an individual simply because they refer to God with a different word to what you use is wrong. YOU may exclusively associate "Allah" with the false god of Islam but that does not mean everyone else does. I certainly don't and I assess things on their individual merits instead of throwing things in a common bucket and sticking a label on it.