Critical thought is hard

[Iroscato]

First and foremost, don't go into this under the influence of alchohol, that's just...not good. Have your mind nice and prepared and clean, without anything affecting it.
Can you give a link to this 'movie' that you speak of? It may help to let other more experienced debaters than yourself (and myself, I'm not exactly a master of the art) take a look at the logical inconsistencies and fallacies, point them out, and give you a rundown of them.
As to whether you are 'stupid'...don't be so hard on yourself. You've already taken steps to educate yourself further than what you've been taught (what I'm assuming has been) all your life, you just have a little way to go before you're ready to stop absorbing and start dishing out, that's all

Believe you me, there have been plenty of people that have already torn this movie apart for its logical fallacies which is why I felt so confident going in. The problem doesn't lie in the movie unable to give good arguments, but in me unable to give good counter arguments (indeed as the alcohol wears off I can start to see the faulty logic but this does leave me at the conundrum of when I have to face real people and their arguments since I'm not so good at improvisational thought).

So for now, best thing for you to do is avoid direct conflict IMO. No need for you to fight the good fight just yet. Just relax, keep educating yourself, follow the debate as a spectator and not as a player. If it's weighing that heavily on your mind, it will do you no good to worry about how well you can or cannot construct solid arguments.
The theists are losing ground daily, and the harder they get pushed, the louder they howl. It's the natural process of an ideological system that has entered the first stages of a death spiral. Some people are best off just sitting back and watching the fireworks with popcorn and a nice cigar