For those who worship Prophets and say they are divine, you have to know that the Five Pillars of Islam are the framework of the Muslim life. They are the testimony of faith, prayer, giving zakat (support of the needy), fasting during the month of Ramadan, and the pilgrimage to Makkah once in a lifetime for those who are able.
Islam is the worship of God alone and the avoidance of worship directed to any person, place or thing other than God. Since everything other than God, the Creator of all things, is God's creation; it may be said that Islam, in essence calls man away from the worship of creation and invites him to worship only its Creator. He is the only one deserving man's worship as it is only by His will that prayers are answered.
The testimony of faith is saying with conviction, “La ilaha illa Allah, Muhammadur rasoolu Allah.” This saying means “There is no true god (deity) but God (Allah), and Muhammad is the Messenger (Prophet) of God.”
The first part, “There is no true god but Allah,” means that none has the right to be worshipped but God alone, and that God has neither partner nor son. This testimony of faith is called the Shahada, a simple formula which should be said with conviction in order to be Muslim.
The testimony of faith is the most important pillar of Islam.
"He is Allah , other than whom there is no deity, Knower of the unseen and the witnessed. He is the Entirely Merciful, the Especially Merciful.
He is Allah , other than whom there is no deity, the Sovereign, the Pure, the Perfection, the Bestower of Faith, the Overseer, the Exalted in Might, the Compeller, the Superior. Exalted is Allah above whatever they associate with Him.
He is Allah , the Creator, the Inventor, the Fashioner; to Him belong the best names. Whatever is in the heavens and earth is exalting Him. And He is the Exalted in Might, the Wise". (Surat Al-hashr)
And yes, "Allah" is worshiped by arabic Christians and It's the Aramic word for God. Jesus message was quite clear: Worship God and believe in his Prophets.
