Because the word Islam means submission to GOD. And anyone who fully submits to GOD is a muslim. So what does that make Prophet Abraham (pbuh)...MUSLIM! What does that make Prophet Jesus (pbuh)....MUSLIM!
And the list goes on. A muslim simply means one who fully submits to GOD....so say it in arabic or say it in english.
Abraham and even the first man Adam were Muslims. That is because Islam is not a "new" religion, but Islam is the same religion given to Adam, Moses, Jesus, Muhammad, and all the Prophets sent by God. The Prophets were all were sent by God to mankind telling us the same thing: there is only 1 God and to worship nothing but Him, to believe in the next life, and to do good on this earth...The Torah, The Bible, and The Koran were all sent by the same God. The problems came when people began to re-write the words of the Torah and the Bible, so God sent the last holy book, the Koran as a guide and warning to mankind. The Koran speaks heavily of Moses, Jesus, King David, Soloman and amny Prophets mentioned in the Bible and the Torah. This is because God sent all 3 books. Islam is not a new religion.
