This can best be answered by this http://gospelformuslims.org/bible_final.htm and basically one should heed what it says, that "He Himself is “the Alpha and the Omega, the first and the last, the beginning and the end” [Rev.22:13]. Christ is the sum total of all that God has spoken to man. The final expression of this is contained in the book of Revelation which was given by God to Jesus and then to John [Rev.1:1]. This is God’s final revelation about His Son and the Son’s final revelation which He gave to His apostle [Rev.22:16].
Anyone who adds to this final revelation will come under the judgment of God [Rev.22:18,19]."
I don't know of any reputable or credible theologians who will suggest or condone the idea that there is or can be "new scripture" to be revealed and it is obvious to anyone who has studied the Bible (and understands the deceitful wickedness of Satan and his minions) that the lie that there are "new revelations" is the cornerstone of all cults, man made religions that are designed to lead souls away from God and his gospel, away from the truth. Modern or "new" revelations never confirm the Bible in its entirety and that is the test - scripture will never contradict itself, nor would new revelations if they were from God. You'll find such contradictions demonstrated in "new age" philosophy, the Book of Mormon, Jehovah witnesses, the Urantia Book (which is a product of automatic writing claiming to be the new revelation to replace the Bible), the Koran etc.
It makes sense that if there is ONE infinite, omniscient, omnipotent creator God of love that he would have a plan for a sinful fallen humanity, provide us with ONE how and why of our existence, truth, knowledge and wisdom to live life to the fullest with purpose and that provision is without a doubt the best selling book in history, the Bible. Believe it, there is only one way to God and that is through Jesus Christ who came from heaven down to earth to experience humanity only to willingly sacrifice that sinless life to pay our debt to a just God. God's ways are not man's ways and though you may not understand him (at the moment), never doubt him, his word.
The devil can provide you with new revelations 'til the cows come home, but what he can't do is create a religion based on the son of God who was witnessed to have lived, died and was resurrected in order to save all those who will accept it and believe in him. It is called the gospel of salvation and it is the only way to God.