repsonse to non christian joining christian church

In response to kolby's non christian joining christian church post i feel as though a person can be a christian to a certain extent. A christian is someone who does good deeds or God' work. God's work consists of doing good, helpful things for others, such as building homes for people who have lost theirs or helping feed the hungry. Anyone can do things like this, so considering this part of being a christian Robert Jenson could do this. The other part is believing in God, which Robert Jenson doesn't so therefore i fell as if he isn't a full christian, but doesn't mean he cant consider himself one and do good things for others.