There is not always consensus on what it means to be a church. The New Testament presents some principles that can minimise these doubts and, at the same time, demystify the current emphasis on growth models. Biblically, it can be said that this constituent essence of the church has a strong connection with what Integral Mission Theology proposes as a vision for the church. Doing Integral Mission is not about introducing a new programme into the church, much less adhering to a new theology with an emphasis on Latin American churches; it is about understanding what the church is based on the instructions of the New Testament. This is the purpose of this work: to understand what the church is so that it may experience natural growth, neither forced nor fabricated.