Why didn't Moses make it into the Promised Land?
Was it because of disobedience or was it because of a lack of faith?
Are they one and the same thing?
I think Moses misrepresented God at the Rock by causing the water to flow by his own strength and understanding instead of relying on the Provision and Work of God. Which caused Israel (and everyone else who would attempt to emulate them) to think that is the way.
Is there more to it than this?
The incident with the Rock and the water was the cause of Moses being banned from the Promised land.. Moses forced Gods hand during that incident.. Moses never gave the glory to God, He never told the people that God told him to do it, As far as they where concerned it was Moses who was bringing water forth from the stone..
Numbers 20:KJV
7 ¶And the LORD spake unto Moses, saying,
8 Take the rod, and gather thou the assembly together, thou, and Aaron thy brother, and speak ye unto the rock before their eyes; and it shall give forth his water, and thou shalt bring forth to them water out of the rock: so thou shalt give the congregation and their beasts drink.
9 And Moses took the rod from before the LORD, as he commanded him.
10 And Moses and Aaron gathered the congregation together before the rock, and he said unto them, Hear now, ye rebels; must we fetch you water out of this rock?
11 And Moses lifted up his hand, and with his rod he smote the rock twice: and the water came out abundantly, and the congregation drank, and their beasts also.
So Moses said that WE as in Moses and Aaron where bringing water out of the Rock for the people.. Now of course God was the only one who could bring water out of the Rock but to the people it would seem that Moses was taking the credit along with Aaron for causing the water to be produced.. Moses had to hit the stone twice.. God was placed between a rock and a hard place because if He did not cause the water to flow then the people would have killed Moses and Aaron on the spot and the whole exodus endevour would have ended in chaos.. So God was forced to bring forth water and was thus humiliated by Moses on that day..