The unity of G-d expressed in Shema versus Baruch Sheim and the reason why the people of Jericho would skip it:

The first verse of the Shema corresponds to the higher level of divine unity known as Yichudah Ilah in which everyone and everything is completely nullified to G-d. Contemplating this message of unity of G-d brings a Jew to great love for G-d and leads to the service of Iskafya and Is’hapcha. This is why the residents of Jericho, commonly known as Anshei Yericho, were accustomed to go straight from saying the first verse of Shema, to saying the paragraph of Viahavta, to love. They did not want to make any interval in between Shema and Vihavta in order so they can experience the passion and love immediately after contemplating G-d’s unity. They did not even want to say the verse of Baruch Sheim Kevod Malchuso Leolam Vaed as this verse represents the lower level of unity known as Yichudah Tatah, in which the world and its creations feel their existence, although acknowledge the fact that they receive their energy from G-d. [This is a lower level of divine unity and its contemplation would dilute and weaken the intensity of passion and love that they experienced in the contemplation of Yichudah Ilah.] This lower level of unity is relevant even for Gentiles.

Torah Or p. 66b-67b