Unlike the lower worlds, what kind of strong forces can there be in the lower worlds?
Thus, when Zhou Tian sent his angels to those realms, even the weakest two-winged angels were seen as invincible by the residents there. When these angels showed some goodwill and granted them great powers, those living beings naturally couldn't refuse the allure of these angels. As a result, in a short time, they began to believe in the angels, either actively or passively.
However, in the middle worlds, although the same tactics are effective everywhere, the presence of strong forces in those middle worlds at the time made it significantly more challenging for the angels to preach.
The main reason preaching was so smooth in the lower worlds wasn't just because those angels were persuasive, but because they were strong enough. When they encountered living beings who refused to believe in them no matter what, the Angel Race often resorted to force to eliminate them.
