What is the purpose of the church? Is it really that important that I be a part of it if I am a Christian? God gave the church tremendous power through the apostles’ doctrine (aka the New Testament). The church is not just something that is a part of Christianity. It is the ordained institution through which Christians serve and praise God. It is important that not only every Christian be in a local church body but also that they are humbling and submitting themselves to its authority in their lives.