"This day have I perfected your religion for you completed my favor upon you and have chosen for you Islam as your religion"

Qur'an: 5/3

    "O ye who believe! enter into Islam whole-heartedly; and follow not the footsteps of the Evil One; for he is to you an avowed enemy."

Qur'an: 2/208

    "The religion before Allah is Islam (submission to His will): nor did the people of the Book dissent therefrom except through envy of each other after knowledge had come to them. But if any deny the Signs  of Allah Allah is swift in calling to account."

Qur'an: 3/19