Ok, heres the rule...depending on the Language, is when you can use "God".
In English you can call God-> God, In Chinese "Sun" ...etc
When you call God in english "Allah", thats no longer God anymore. I'm bringing this out as a discussion topic, because the Bible reveals God as God.
Hence, God says...
"I am who I am"
etc...there are more others, like "my name is..."
Because frankly, God is who God is...
Hence for muslims to use the word "Allah" in english, it is refereing to their God, and not the Christian God.
Christians who speak arabic will use the word "Allah" because it refers to God as a definition of God. If they used the english word "God" in arabic, then it's refering to the Christian God, which isn't right, because as said above...
God is who God is, there is no other.
Hence it is not the same, and many Christians who have been bombarded with noise from muslims with allah this and allah that...it's not the same. It's annoying!
God is who God is...theres no point in muslims bring their own logic in to dictate who God is, because God is who God is, the Creator and Ruler !