During my recent gospel meeting, a couple gave me some tomatoes from their garden. They explained that they didn't know the name of the variety, but that it was an "old-timey" tomato and you couldn't even buy the plants. It was necessary, they said, to save the seeds if you wanted more of this kind of tomato for next year.
Jesus compared the gospel to seed that was cast into the ground (Mt. 13:1-23). In the parable of the soils, the seed in the good ground brought forth according to its nature and in abundance. There are other similar thoughts in scripture. For instance, Paul teaches that we reap as we have sown (Gal. 6:7,8). We either sow to spiritual things that result in eternal life or worldly things that result in corruption. Paul also teaches that the abundance of reaping depends on the amount sown (2 Cor. 9:6).
How do we promote New Testament Christianity to the world today? Like those "old timey" tomatoes, there isn't a plant to buy; you must have the seed and that seed is the gospel. We take that seed and plant it in the hearts of men all over the world hoping to find good soil that will produce New Testament Christians. That is the purpose of evangelism. The seed is not intended to produce disciples that look, act, speak or think like us. It is intended to produce disciples of Jesus Christ who follow him as he leads us to God (Jn. 14:6).
I've noticed, though, that some among us want "hybrid" Christians. They talk about the gospel, but not enough to make a difference. They draw them with entertainment, gimmicks, "felt needs" and the like. The emphasis has changed. It is no longer about the seed and its fruit. It's like saying we'll plant one kind of seed because it's easy to care for, but we want a different kind of fruit because we get more per plant! That may sound silly, but is it any different than what is happening in religion today? The emphasis is on numbers, not New Testament Christians. Over time, people may forget the gospel and pin their hopes on a "hybrid."
Our duty, as Christians, is to plant the seed. When we do, pure Christianity will result and men will be saved. In the meantime, let's keep the seed as it is.