Does God really see everything we do?
Yes, God knows all things and is fully aware of everything that we do. In fact, God knows everything that has happened in the past and all that will happen in the future. His knowledge, however, does not in any way take away our freedom to act. Because God loves us, he has given us the freedom to choose, even when he knows our choices may not be the best ones possible.

Why do I have to go to church on Sunday?
For the same reason that you "have to" give people you love a present on their birthday or at Christmas. For the same reason that you "have to" say "thank you" when someone gives you a very wonderful gift. For the same reason that you "have to" spend time with people you love at special, important moments in their lives. You see, the "have to" that's connected to going to church only seems like a burden when you forget that it's all about showing love for someone who has loved you, more than you can ever possibly know.