Allah is an Arabic word for God. So when anyone speaks of God in Arabic, he would naturally use the word Allah. Thus the word God and Allah are generic in English and Arabic respectively. What precise concepts we have of these words would depend on the religion we follow.
Words are products of language with general meaning, while specific meanings in a language are products of culture. The words of all languages when spoken in another language would mean the same. The word Allah in Arabic would mean the same as the word God in English or Ishwar in Sanskrit. But the same words used in Islamic, Christian or Hindu culture would mean differently in each to the extent that each word would then have a specific connotation. So the word Allah when used as part of expressing oneself in Arabic would have a generic meaning and when used as part of expressing oneself in the context of Islam would havd a specific meaning. This distinction ought to be kept in mind, otherwise it would lead to confusion.
