Money influences many things but it can't buy skill. You can take classes in any art from the best teachers and coaches available, but only effort, sweat and will power can buy skill. Money can give you the freedom and time to practice things, and get you better gear and instruction, and buy you the tools that help facilitate skill but skill is only between you and the art. Money may or may not open the door, but only your effort and will can walk you through that door.

The problem with saying that money is behind everything is that it's just a bias. You could just as easily substitute the word money with "health" or "air" or "water" or "food" or "sleep" or a million other things.