What would have happened had Moses tried to figure out what was needed to accomplish God's command? One of the biggest arithmetical miracles in the world was required in the desert.
Moses led the people of Israel into the desert .Now what was he going to do with them? They had to be fed, and feeding 3-1/2 million people required a lot of food. According to the U. S. Army's Quartermaster General, Moses needed 1500 tons of food a day, filling two freight trains, each a mile long. Besides, you must remember, they were cooking the food. Just for cooking this took 4000 tons of firewood and a few more freight trains, each a mile long and this is only for one day (not to mention for keeping warm, and if anyone tells you it doesn't get cold in the desert don't believe them!). They were for forty YEARS in transit!!!
Let's not forget about water, shall we? If they only had enough to drink and wash a few dishes (no bathing?!), it took 11,000,000 gallons EACH DAY--enough to fill a train of tanker cars 1800 miles long.
And another thing! They had to get across the red sea in one night. Now if they went on a narrow path, double file, the line would be 800 miles long and require 35 days and nights to complete the crossing. So to get it over in one night there had to be a space in the Red Sea 3 miles wide so that they could walk 5,000 abreast. Think about this; every time they camped at the end of the day, a camp ground the size of Rhode Island was required, or 750 square miles.
Do you think that Moses sat down and figured out the logistics of what God told him to do before he set out from Egypt? I doubt it. He had faith that God would take care of everything. Let us have courage, we share the very same God!