He sets out his criteria wisely in order of priority:
Firstly "Does it preach and teach the Gospel?" (That is all the core theology that can not be compromised eg. penal substitution) This is the one question that if answered "no" then it is straight off the list of possible churches.
Secondly "Where does it's theology stand?" Do I disagree with some of it's views on the bigger doctrines that would make it hard to worship,serve and be fed by the sermons.
Thirdly "Are there opportunities for me to serve the church?" along with "How does it try to do community discipleship and being a missional church?"