Ok, so I know that I am probably going to be hearing it over this one...BUT...
As a Christian who believes that going to church is important, I want my son to be taught at his Christian preschool by someone who holds that belief too. If I found out that someone who worked for my son's Christian preschool doesn't go to church I would probably go ask the school director about this.
Do I believe that you have to go to church to be a christian? No. But I do believe that when you are a Christian, you will want to go to church to be around people of like faith, to be challenged in your faith, to learn more about God and to have fellowship and worship with other believers. This is important - as you can read it thru out all of the New Testament. With young children, especially, they learn by what they see. I know that when we, as Christians, are not consistently trying to improve our relationship with Christ - which I believe, includes going to church then we are not modeling to our children the right message.
Princess, I do not know you and know even less about your relationship with Jesus Christ. I am just trying to give the reason why this question is on their application and why it is important to them. So please do not take this as a personal attack on you.
As for the weight issue - that is a whole other ball game.