The gospel of the Kingdom is about ending Satan's war and political treason against Yahweh and vindicating the Father. The two opposing kingdoms (not churches) are at war. Babylon vs Jerusalem. Kingdoms at war, not churches at war.

You tell me which is universally and eternally more important? "my salvation?" or the Father's victory and vindication, ending the conflict of the ages and redeeming the lost? (which, by the way ALSO will result in my salvation).

The four gospels of Jesus (Matthew, Mark, Luke and John) contain 121 references to "KINGDOM" and only 2 to "ekklesia". The entire New Testament has fewer references to "ekklesia" than the gospels alone have about "kingdom". Many (most?) of the references to "ekklesia" are more about kingdom (citizens) than church (members). It is our misinterpretation and preconception that hears "church" instead of "ekklesia" (citizens).

Based upon His cumulative teachings, Yahushua, the Messiah, never taught "church". Instead, He preached the "kingdom"

See Matthew 4:23, Matthew 6:33, Matthew 10:7, Matthew 24:14, Luke 16:16. Also see The True "Gospel of the Kingdom"

Oh, you say, but the apostles had plenty to say about church. Did they? or were they discussing ekklesia (citizens of the kingdom?). If, in some instances, the concept may have deteriorated sufficiently that they actually meant "church", men tend to teach / share what THEY think is important, or what they find will "play in Peoria". Some of what the apostles taught was NOT so much the gospel of the kingdom but the gospel of salvation and church. Paul admits this when he is preaching HIS gospel rather than the "Gospel of Christ" - the "Gospel of the Kingdom".

In the day when God shall judge the secrets of men by Jesus Christ according to my gospel. Romans 2:16

Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, Romans 16:25

On the other hand, go re-read those verses that are translated "church" and think "citizens" instead, and see where that leads.

So, I ask, is it more important to teach what the apostles taught? or what the Master taught?

The biggest problems with churches is that they are ruled by men. Unfortunately, almost all organizations of men have men as leaders (rulers) and it is easy to have religion without the Spirit. We aren't asked to get religion. We're invited to enter the Kingdom of Yahweh.

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A final question and thought:

If we are the church and the church is the bride, who is invited to the wedding feast? The Wedding Feast

If, on the other hand, the bride is the kingdom, then we as citizens are the invited guests.