Rather than tell you that your religion was false because of the harsh punishment you use, I think it is more appropriate to say that we cannot use the harsh punishment described in the Old Testament because of Jesus Christ. There is an important distinction to be made regarding who should be punished and for what, but I will leave that to others.
Thank you for clearing up deception and when it may be used. That is reassuring.
I consulted my notes, and I thought Islam grew out of Arianism. If that is wrong, I apologize. I’ll take your word that it was closer to 600 years after the death of Our Lord (now that I know I can take your word

).
Concerning the evidence that the entire deposit of faith that had been delivered, here are some handy quotes from the New Testament (BTW, these also make it impossible for denominations such as Jehovah’s Witnesses and Mormons, both of whom claim revelations AFTER the time of the apostles):
Matthew 28:18-20 "Then Jesus approached and said to them, “All power in heaven and on earth has been given to me. Go, therefore, and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit, teaching them to observe all that I have commanded you. And, behold, I am with you always, until the end of the age.”
John 14: 26 “The Advocate, the holy Spirit that the Father will send in my name - he will teach you everything and remind you of all that * told you.”
John 16: 12-13 “I have much more to tell you but you cannot bear it now. But when he comes, the Spirit of truth, he will guide you to all truth. He will not speak on his own, but he will speak what he hears, and will take from what is mine and declare it to you.”
The first verse is a commissioning of the Apostles to go out. They have what they need to know. In addition, all of these verses make it very clear EXACTLY who will guide the Church: the holy Spirit. Not a prophet. Furthermore, that same holy Spirit will be with us until the end of the age (when Jesus returns).
(formerly known as “lutheran farmer”)*
What you quoted gives me an impression that is the exact opposite of what you were claiming. They are saying someone will come after Jesus.