Also, since you're claiming it's a serious statement and not just a troll, let's actually look at it:
And all investing is gambling, otherwise, it wouldn't work.
Investing is - at its core - putting in money into an enterprise with the expectation to make more money than you put in.
For example, let's say I put $100 in Coke. I'm investing in that company with the expectation that they will make a profit, and share some of that profit with me, such that I make more than the $100 I put in.
Is there an element of risk? Sure. Something could happen such that Coke stops selling. It seems like a very small risk to me, but YMMV. Pick something you don't think is risky if you'd like to tweak the example.
That doesn't make it gambling. I'm investing with the expectation of getting more in return than I invested. How is owning shares of a profitable company that gives dividends "gambling"? Because there's a small chance they might fail?