Well, while I agree with you that poker is a game where you must display skill as well as possess good luck (no matter how skilled you are at it, if you don't get the right cards, you aren't going to win [unless your bluff is very good]), let us assume a scenario whereby you are playing a hand of Texas Hold 'Em and your cards suck (say, a two of clubs and eight of diamonds). You desperately need the pot to stay alive, so you raise - and all but two of your opponents fold. Great - you've sold your bluff! All you need now is for the cards to fall your way, and...Ace of Hearts, King of Spades, Jack of Clubs????OH NO!!!
Now, your brain goes into overdrive - do I check? Do I raise? How much do I raise? And this reaction - this thought process - leads to the actions which define gambling: at this point, no matter which course of action you take (aside from folding, and seeing as you've already raised once before, folding wouldn't be very productive), you are taking a gamble that your choice pays off. Short of telekinetic powers, there is no way to know with 100% certainty that your bluff will work - ergo, you're taking a gamble.
Unless one can find the outcome with 100% certainty before it is "decided", then it is gambling. Playing a few hands of poker at a table - a real table, rather than an electronic one - offers you a greater degree of control and freedom over how you play, but considering that the outcome is unknown, it is still gambling.