The Sunday worship liturgy is important because ideas have consequences. Our symbols represent ideas. Therefore, we better think about what we are doing. Every church has a liturgy—and thus every church expresses ideas about how we are to live and walk before God. And so, we had best have our theology right and have that theology reflected in what we do and how we do it. Moreover, we do it at the beginning of every week, so that we start the week right, and then we go home and do it, and we do it at work, and at play and we do it all the time and everywhere.
The liturgy is simply practice for life. We come before God, we pray, and listen, and sing, and confess, and receive absolution, and give, and are taught, and commune, and are sent forth with blessing, and we do it again-and-again to get it into our bones. We want worship to be second nature to us. This is why we can never safely skip worship. There is nothing you do every week that is any more important than worship. Make the decision to attend public worship only once in your life.