ilah,became Al-ilah,The god,or Allah (satan)

This is what Christian redmissionary claims

The Muslim's claim that Allah is the God of the Bible and that Islam arose from the religion of the prophets and apostles. Islam is refuted by solid, overwhelming archeological evidence. Islam is nothing more than a revival of the ancient Moon-god cult. It has taken the symbols, the rites, the ceremonies, and even the name of its god from the ancient pagan religion of the Moon-god. As such, it is sheer idolatry and must be rejected by every born again Christian.