One interpretation is that Moses' eyes were miraculously altered so that he could see spiritual phenomena. God may not have a material body, but Moses' prophetic powers allowed him to see non-material phenomena.
In the bible it is said Moses saw Gods back only.
No as you see the bible says god did not reveal himself to Moses. But he did see gods back.
When Moses was in Midian, God sent him back to Egypt in order to begin his mission of taking the Israelites out of Egypt (Exodus ch.4).See also:The ExodusJewish history timeline
Moses asks God if he can see him
Moses was chosen by God to see that Pharaoh released the Hebrew slaves.
God told Moses to go back to Egypt.
God called Moses to mount Sinai.
Moses praising God means he was devote in his belief. I don't see that it could say anything else about him.
A bush which burned but was not consumed.
No, Moses died peacefully, when God took him (see Deuteronomy 34).
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No, according to the Bible, Moses never saw God's face during his encounters with Him.