No, no it isn't. Considering the religion tolerated the existence of others for its first 500 years without problem - do keep in mind that Muslism were the ruling MINORITY in the Arab lands until aftr the Mongol invasions when mass conversions began. They were considered the most tolerant of religions - the idea of Judaism and Christianity in there eyes were those who once followed the book but did not take the next step to believe Muhammad as the last prophet.
Allah is simply the same as us saying God - they are the one and the same. Do people of Christianity and Judaism not believe in the will of God? Same thing, different name, but same.
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