Yet it is. Allah simply means "God" in Arabic. Arab Christians were calling God "Allah" before Islam existed, and they still do today.
I've seen an infinite number of claims to the contrary on FR, of course, but simply asserting something you want to believe doesn't make it true. Arab Christians are running around today routinely using the term "Allah" for God and they don't care what you think or assert.
Ditto for Arabic-speaking Jews.
Correction: Allah simply means
"God" "god" in Arabic. Maybe it will be good for Arab Christians to start using a different word for God. And I don't believe for one minute that Arab-speaking Jews use the term Allah, they have a beautiful selection of Hebrew names for the God of Abraham, Isaac and Jacob!
Allah or Tuhan are the terms for “God” used in Indonesia centuries before Mohammed was born, and still used today, even in Indo churches here in USA.