God does not operate as humans do by applying logic to a problem He is trying to solve. God chooses His Method based upon many factors, not just how many people will believe in Him. There are other reasons to use Messengers, not the least of which there is an important message God wants to make available to everyone, and a Messenger is the only way to accomplish that.
There are more and better ways than a single messenger. Sorry but you are repeating dogma.
I never said that the God’s Goal was to get the message out to all of humanity right away. I said that God using a Messenger makes it possible to get the message out to all of humanity, and people will come to accept that message over a period of time.
The text you reference contained the goal otherwise the text wouldn't exist.
Given the history of religion, this method has been slow to get believers in the new religion right after it was revealed and for a long time afterward, but it has accomplished its purpose of getting people to believe in God, since 93% of people in the world believe in God.
84 percent of the world population has a faith and those faiths all have some kind of Founder, what I refer to as a Messenger. So obviously, using Messengers is a successful method of communication.
Again you are talking dogma. People having a general belief in God does not mean every belief is due to a messenger of God as a true messenger. Obvious a number of religions do not accept your messenger, Islams, Jesus, etc, etc.
If God had never used Messengers, hardly anyone would believe in God because the main reason people believe in God is because of one of those Messengers. Only about 9% of people in the world believe in God for some other reason.
Again you are talking dogma. Primitive belief systems started well before any history record of a specific figure.
You are certainly right that the Messenger method has a poor track record when it comes to the next Messenger, but the reason for that is because people of the older religions cling tenaciously to their older Messengers and religious traditions, thus every new Messenger is always rejected when He appears and for a long time afterwards. This is mostly the fault of the religious leaders of the older religions who attempt to keep their flocks in tow because they are not willing to relinquish authority and power. Another reason for the rejection of the new Messenger is that the followers of the older religion do recognize the fulfillment of prophecies by the new Messenger since they misinterpret prophecies in their scriptures.
Or it could be due to people not believing the claims of the next messenger, people do not believe X is a messenger at all but a fraud.
If communication is not verbal or text, what would it be?
If I started spouting verses from a religion I do not know that would be a form of communication from God to me. However in general communication between humans can include sign language, emotions, facial expressions, body language, etc.
Why would it be left up to me how an omnipotent God chose to communicate?
No no. "It's up to you" was about "another subject I can explain later if you are interested." I was saying it is your choice to explain not your choice regarding God's method of communication