Of Mutts. My families, by both birth and marriage, have owned a number of dogs, mostly mixed-breeds. Caesar joined our family when I was in second grade, we affectionately referred to him as a cross between a cocker spaniel, a dachshund, and a mutt. The dog we now own, Graceyn, is a Westie-Poo, a mix between a West Highland terrier and a poodle. Only Ginger, a golden retriever we had for a few years, was a purebred.

My wife’s family has owned a number English bulldogs. It’s a tenacious and tough-looking dog originally bred to take down thousand-pound bulls. But they’re very loving and loyal to their owners, with the endearing wrinkles of a fuzzy teddy bear. It’s also a breed in trouble, as this recent CBS News article reports.

That’s the thing about purebreds: the inbreeding leaves animals without enough genetic diversity to overcome inherited health problems. The very thing that keeps the breed pure also risks its extinction.

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Of Methodists and Mennonites. When I was a kid my family moved around a lot, so I’ve been part of many different churches. Though our roots were in one of the 31 flavors of Baptists, those roots did not define us as we sought out a new church home with each move. I first made a faith commitment to Jesus in the Sunday School of our “community church” in Minnesota. In Texas we joined a “Bible Church.” In British Columbia, I was baptized in an Evangelical Mennonite Brethren church.

During high school in Germany, we joined the American Protestant Church, whose pastors were primarily Methodists and Lutherans. I went to a Free Methodist university for a year before joining the Air Force, where I sat under chaplains from the United Church of Christ, Salvation Army, Southern Baptist, and Seventh Day Adventist denominations. Later I would attend both Presbyterian and Assembly of God churches. I guess you could say I’m a bit of a spiritual mutt.

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Inbreeding is as harmful in churches as it is in dogs.

In some church worlds, it’s all about doctrine: we are united by what we agree on, and because we agree. Of course, we are also therefore divided by what we believe. But Jesus sought and prayed for unity within His body, the Church. He rarely talked about believing the right things—unless it was about who He was or what He could do.

Shortly before He was crucified, Jesus prayed “that they [His followers] may all be one … so that the world may believe that you have sent me” (John 17:21). In other words, the greatest strategy for growing the Kingdom of God is unity within the Church.

For too long, though, Christians have sought a false unity, focused not on who Jesus is, but on how we should behave: who can and should lead, how much water to use in baptism, and which sins are acceptable and which will keep you from heaven. We argue about fine points of doctrine: what “is” really means in the Lord’s Supper, and when Jesus will return. (Hint: even He didn’t know!)

Our arguments divide rather than unite, and they keep bewildered onlookers out of our churches and out of His Church.

Doctrine—right believing—is important. Right doctrine leads to right conduct. Seeking right doctrine is what led to numerous councils over the past two millennia, beginning with the Jerusalem Council (Acts 15, Galatians 2). Seeking right doctrine gave us the Apostles’ Creed, the Nicene Creed, the Westminster Confession of Faith, and more.

Over the past several years, I’ve looked at hundreds of church websites and doctrinal positions from a dozen or more denominations. Ironically, for all the distinctions in these groups, the doctrinal statements are so similar you’d think they could be from just one or two churches, not dozens. And one of the most common introductory statements is this: “In essentials, unity; in non-essentials, liberty; in all things, charity.”

The problem is, we cannot agree on what are the essentials but seek—in vain—for unity in the non-essentials; and we show precious little charity in most things.

As a result, our differences are centered around things on the periphery, and what unity we have has led to the same type of inbreeding that is endangering the English Bulldog.

We need some doctrinal cross-breeding. We need tables for conversation, not fences down the middle of God’s Kingdom.

We need to breed more spiritual mutts.