You're pretty wrong.
If 10 people sit at a poker table, and did absolutely no betting whatsoever and just looked at the cards as they are predetermined, you would win 1 out of every 10 hands on average.
There is plenty of skill involved to win more than 1 in 10 hands. And it's not just bluffing. As you don't know what your opponent holds you could make an argument that there's no such thing as bluffing (as you might be bluffing a bluffer). Gaining information, using betting strategy to ensure that your opponent is making mathematical mistakes, etc. are all a part of the game. Luck sometimes comes into play, but there's a reason why there are a few consistantly winning poker professionals and it's not because they're just super lucky.