God appeared to elderly Abraham and introduced Himself as "God Almighty."  The Hebrew behind that name is El Shaddai.  It is a name that highlights the limitless strength of God.  God wanted Abraham (and you) to know that there are no boundaries to His ability.  There are no problems that are too much for Him, no challenges too tough for Him to tackle.  There is nothing He can't do!  The God you worship is God Almighty.