The first place the name The Most High God appears is Genesis 14, where Abram rescued his nephew Lot from the kings of the land. The name in Hebrew is El Elyon and its translation is correct – the highest God.
Two chapters before Abram was called by God and given Canaan as an inheritance. He then went down to Egypt because of a famine, and there acted foolishly and without faith; he feared what the people might do to him because of his beautiful wife.
Lot moved to Sodom that evil city because there was not room in the land for both he and Abram. Abram rose in faith to rescue Lot from his captors and after doing so met the King of Salem, which is king of peace. From the context of Genesis 12-14, Abram, as Romans 4:20 (NASV) translates it, “…staggered not at the promise of God through unbelief; but grew strong in faith, giving glory to God.”
Most importantly was the God that Abram placed his faith in, El Elyon or the God of all the kings of the earth, The Most High God, the God who has all authority and answers to no one but Himself.
When the Christian says he has faith in God he does not mean just any god, but the God Abram believed was stronger than all the kings and all the nations of the world. The Christian is never to be conformed to this world, but transformed by the renewing of his mind, so that; he might see God as God over all, He can be trusted, and we should keep His commands even when we are not clear why.