Can you show me in Scripture where such a thing is preached just as you've described it here?
Paul spoke of the Gospel of the Kingdom, not the gospel of salvation in at least three scriptures but did not elaborate, That is why Paul has been more popular then Jesus in the religion because attention can be focussed on other things than the Kingdom.
But ALL of Jesus teachings focused on the Gospel of the Kingdom.
he spoke of the self serving , self justifying will of man, of man changing the definition of good and evil to serve their purpose. He spoke of how they used their positions of power in church and out for gain at the expense of others. He then told of how we are to put the will of the Father first , a natural outcome of Loving Him over mankind, this loving neighbour as self, being selfless, servants to all. He showed how man's ways made all the evil in the world and how Gods ways would correct that. He commanded us to repent of man's ways for the ways of the Kingdom.
He did not divide man the ways man does, politically, by race, colour, religion etc,. The division He taught was between the will of man vs the will of God. Man;'s word we have built on our nature vs the Kingdom built upon God's. He told us to chose. Snipets of scripture are not necessary. Read what Jesus taught in the four Gospels with a mind aware of the division.
Romans 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
James 4:4 Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? whosoever therefore will be a friend of the world is the enemy of God.