The Muslim use of the word "Allah" for their god was simply an imitation of the Christian Arab use of "Allah" for God for centuries before Muhammad robbed his first merchant.
The Lord Jesus Christ warned of those preaching a different 'Jesus' which Islam does.
Thank You! Allah is a generic word for a divinity just like the English word God. Show me ANYWHERE in the pislamic "holy" books (koran or hadith or the sira) that the arabic name for Yahweh is mentioned. In syriac it's Mariah (MAAR YA). If we can translate it so could they, but they don't. What further proof do we need that they do not worship the God of Abraham, Issac, and Jacob/Israel?