Islam. The Religion of Submission to God
If anyone desires a religion other than Islam, never will it be accepted of him; and in the Hereafter He will be in the ranks of those who have lost (All spiritual good).
This translation of verse [3:85] is by the well known scholar ('Abdullah) Yusuf Ali. In his commentary on this verse (note: 418), Mr. Yusuf Ali writes:
"The Muslim position is clear. The Muslim does not claim to have a religion peculiar to himself. Islam is not a sect or an ethnic religion. In its view all Religion is one, for the Truth is one. It was the religion preached by all the earlier prophets. It was the truth taught by all the inspired Books. In essence it amounts to a consciousness of the Will and Plan of Allah and a joyful submission to that Will and Plan. If anyone wants a religion other than that, he is false to his own nature, as he is false to Allah's Will and Plan. Such a one cannot expect guidance, for he has deliberately renounced guidance."
Many verses in the Holy Qur'an explain the meaning of Islam as the one religion of God, revealed to all prophets. Islam is not Muhammdanism. It is the religion of submission to God, though it also is by name, the religion of Muslims.
"Take heed that ye do not vacillate in your determination to embrace the truth of this Cause--a Cause through which the potentialities of the might of God have been revealed, and His sovereignty established. With faces beaming with joy, hasten ye unto Him. This is the changeless Faith of God, eternal in the past, eternal in the future. Let him that seeketh, attain it; and as to him that hath refused to seek it--verily, God is Self-Sufficient, above any need of His creatures. "