As a missionary serving in rural India, I'm curious - would that 'Gospel" be the Baptist one, or the Catholic gospel?
What about the Evangelical Free Gospel, or would it be the Messianic gospel? All of whom make the same claim: that it is only THEIR catechisms and doctrines the Apostles taught - and anything outside those beliefs and traditions is deviation and heresy.
When preaching the Gospel of the Kingdom of God to those who have NEVER heard of Jesus Christ - there is ONLY ONE MAXIM, ONE DOCTRINE THAT MATTERS, and Paul stated it clearly in I Corinthians 2:2.
Doctrine does not win people to Christ. Not catechism, not order of worship, not Sabbaths or Sundays. Christ and Him Crucified is all that is necessary to be known.
While we justify ripping one another to shreds over doctrine and purity - we lost the American heritage and culture to overt wickedness and sin. It's always easier to bash a brother or sister, it's safer. Safer than confronting the real bully down the street. The one who is going to shove secular hedonism or Sharia down your throat after pantsing you.
I guess what is left of Christianity in America is limited to the Lukewarm or the Pharisee.
God forbid we sit in 'judgment' of sin, but hey - sitting in judgement of who is and who is not a Christian - that's what it means to be Christian in today's vapid culture apparently.
Revelation 3:9 Behold, I will make them of the synagogue of Satan, which say they are Jews, and are not, but do lie; behold, I will make them to come and worship before thy feet, and to know that I have loved thee.