Ridiculous.
Here's something that's not a secret: Islam is losing 6 million Muslims a year to Christianity. Islam is NOT the fastest growing religion. In fact, it's in serious decline. Christianity is sweeping through Africa, Asia and the Middle East. Am I surprised this supposedly secret book has been produced in light of the statistical facts that Muslims leaders and clerics are well aware of? Absolutely not.
Islam also claims the Bible, without this "secret Bible" predicts Muhammad's coming, which is embarrassing for those who claim this because it's glaringly obvious they pick and choose verses and run with it without taking them into context. As I've been saying for years, even while I was Muslim, the claims Islam makes about Scripture and Christianity is so stupid that I cringe and am embarrassed for them. This same Bible they claim predicts Muhammad they also claim is corrupt. This same Bible they claim to honor, they call corrupt. You can't honor, let alone believe, something that is "corrupt". They only honor it when it suits them or they think it backs their beliefs.
I can pull some Scriptures out as well and force them to back my own theories and ideals. That means absolutely nothing. But when taken as a whole, the Bible completely runs contrary to Islam and the Koran. This is why Muslims, who most don't even know the Koran because they don't speak or read Arabic, won't touch the Bible. They've been taught since birth that it's corrupt. When most Muslims do read the Bible, it's not the Bible they turn on, it's their own Koran and beliefs.
Whatever this "book" found is, they are dating it to be 1500 years old. If those dates are even correct, it's still not close to being old enough to challenge the earliest recorded manuscripts of the New Testament alone known to exist and securely dated to 2 AD. Some are believed to be older than that, but requires more testing.
This is how Islam had it's beginnings. "Secret" meetings between a single man in a cave between he and the angel Gabriel. Outside of Judaism and Christianity, every other religion, cult or sect has derived from a "secret" book being found, "secret" encounter between an individual and a spirit/angel or "secret" revelations/visions/voices and has led billions astray. Islam believes Jesus' second coming will be a secret and only a select few will know who He is and it will be up to them to announce Him. Another attempt to deceive the masses.
God can't do anything in the open anymore as He used to. No, He's resorted to doing everything in secret to a select, special few. That's a cult. That's deceit. That's not God.
Someone asked me once, after I converted: "How many people wrote the Koran?"
I said "One."
He then asked, "How many wrote the Bible?"
I replied "Many."
He said "Exactly."
I was dumbstruck and quite embarrassed for him. He truly believed that argument was valid and proved the Koran to be true. One witness as opposed to many? That wouldn't even stand in our own faulty courts let alone anywhere else. This is eternity we're talking about. This is no light matter. Should people believe one man who came out of a cave with "secret" revelations over a short period of time or 40 men over 1500 years who were not the only witnesses? Let's not forget the millions who witnessed God on the mountain with Moses and heard His voice (Exodus 19:16) or were led by the fiery cloud through the Red Sea. If one witnesses something, you take it with a grain of salt. If many, you believe what you're hearing to be true and accurate. Muhammad would, very well, be diagnosed as schizophrenic nowadays. Jesus cast demons out of people that exhibited the exact same symptoms as Muhammad.
Keep praying for the spread of the Gospel. God is doing a great work in Muslim nations.