Muslims prove that God did not send their prophet

When God established Christianity, He personally chose its leaders, the 12 Apostles (Mark 3:14-19). God Himself appointed the chief apostle, Peter (Mt 16:18-19; Jn 21:15-17). God Himself sent His chosen leaders to "make disciples of all nations (Mt 28:19-20).

I asked Muslims if God Himself chose their prophet Muhammad, personally talked to him and personally sent him as His messenger.

Muslims responded with the verses John 1:18, John 5:37 and 1Tim 6:16. Muslims believe that these verses show that God never showed Himself to any man and never talked to any mortal.

That means, Muslims were saying that God never showed Himself to their prophet and did not even talk to him personally.

Thus, Muslims themselves were saying that God did not personally choose Muhammad, God did not personally appoint Muhammad and God did not personally send Muhammad as His messenger.

Based on that, how then can they claim or believe that their prophet was a true prophet of God?

Muslims are the ones who prove that their prophet is not a true prophet of God.