Our way of doing things already says a lot about what we believe about God and how he works in this world. There's more to say, but not much more.
WEC is solidly Evangelical. We are a member of the Evangelical Fellowship of Canada, and so subscribe to its statement of faith (see the EFC web site here). However, while we all agree on the essentials, there is, in fact, a great diversity of belief within WEC on other issues. For example, we have widely diverging opinions and practice when it comes to the charismatic issue. So, how do we work together?
WEC plants its theological tent in the centre of Evangelical theology, and extends it out fairly wide (within the Evangelical world). That allows people with many differing views to come underneath. However, and here's the main point here, before we let someone come into the tent we make sure that they are comfortable working together with the others they will find there. For example, if someone is so cessationist that someone else speaking in tongues brings about cries of "Heresy! Heresy!", then WEC is not for that person. Conversely, if one looks at someone who never speaks in tongues and begins to question their closeness to Christ, or even their salvation, then, again, WEC is not for that person.
So, while WEC doesn't tightly specify exactly what one must believe to be a part of us, we do insist on a certain judgment about what's essential and what isn't. We can work together, not because we agree on every issue, but because we agree on the essentials, and also agree about what the essentials are. Differing views on the organization of churches are fine. Differing views on whether the lost are really lost are not.
And there really isn't that much more to say. From the 1920's through to the present, WEC missionaries have been writing and speaking, often very powerfully, about their beliefs and experience. Some of their convictions have found their way into the way we do things. However, it would be difficult to distill from any of this rich heritage a particular "WEC theology". And that's the way we want it. We don't want to narrowly define what we believe. We want to be firm on the fundamentals, but be open to working together with those who disagree on less important issues.