The Census

I have been unsure over the years as to why God was angry at David for taking the census in I Chronicles 21. While reading I Chronicles 27:23-34, I gained some insight. It says that David didn't number them below the age of 20 because of God's promise to increase Israel like the stars of heaven. It seems to me the census was a way for David to see if God had fulfilled this promise. God's wrath was possibly a reaction to David not taking God at His word. I need to make sure that my actions portray a faith in God and what He has promised.