Almighty, then

Something to remember if this ever comes up: with God-like powers and abilities, what you want to make sure you do is not just change things on a surface level, but change reality itself. This will help avoid all sorts of embarrassing questions, such as "Hmm, since when did Amtrak have this many trains?" and "Hmm, since when did those four scantily-clad women start hanging out with Jim 24 hours a day?" Because, as far as anyone else will be able to tell, things will have always been like that.

Granted, there's the small risk that major historical events will have to change to create the desired result, such as an Axis victory in World War II leading to the scantily-clad women thing, but if something like this happens, no one will care, because they won't know. It's a win-win situation, except for the Allies.