Keep in mind, this will all depend on how seriously you take your christianity. I'm sure there are some christians who simply believe in Jesus and their religion doesn't really affect their lives at all. You don't strike me as one of those though...
So to start, if you go to church regularly...you've lost your entire Sunday mornings. You lose all kinds of freedoms for roughly 1/21 of your waking hours every week. Added up over sixty years...and well, you've spent entire years doing what others have wanted you to do. Of course, if your beliefs are true...you'll probably view this as time well spent. If your beliefs are wrong though...then you've wasted entire years of your life...a large chunk of time that you'll never get back. Perhaps this is part of the reason you hate atheists? Deep down you feel like it's a waste of time...and you resent atheists for not fearing hell and judgement the way you do. Overall though, this is a small example of the freedom you've lost.
Would you like to hear more?
Freedom to do what? Sit at home and watch cartoons in my pajamas?
Freedom to lay around and watch porn and touch?
Freedom to wake up and reach for a glass of wine, or a joint, or six pack?
Freedom to wake up and read the latest best seller?
Freedom to wake up and jog, work in the yard, ride a bike, drive to the store, go on a vacation, lay in bed listening to music?
Freedom to have sex all day?
Freedom to run around looking for someone to have sex with?
Freedom to do whatever it is you do on Sundays?
Freedom to go out and fly a kite?
I go to church on more than just Sunday morning my friend. I go whenever I can because I want to. I love going to be with my brothers and sisters. I love being in a place where people can come who have become tired of spending their Sunday mornings engaging in trifles and are seeking some true and lasting peace, joy, and meaningfulness in their lives.
I earnestly seek to spend every waking moment in the presence of God. I assure you my friend, there is nothing that I have entrusted to Him, whether it be my time, my money, my dreams, my goals, my ambitions, and yes my Sunday mornings, that He has not kept and not only that but taken and blessed and restored to me ten fold.
There is nothing I would rather do on any day of the week, than the will of God. No regrets shall I have from taking His will as my own. So I want to encourage you not to waste your time in attempting to present some sort of weak argument as to why I or anyone else who is a son or daughter of the Most High God should do anything other than that which He desires for us to do. He knows what is best for us, not you my friend.