Why did China people worship Bi Xia and Yuan Jun from the Zhou Dynasty?

According to legend, during the period of Zhou Wenwang, Jiang Ziya was appointed as an altar irrigation order. One year, the weather was sultry, and even the wind that could blow the national flag was not blown. Zhou Wenwang was very depressed. One night, in her sleep, Zhou Wenwang saw a beautiful woman crying on the side of the road. Zhou Wenwang was curious and asked her why she was crying. The woman said, "I was the goddess of Mount Tai in the East China Sea. My name was Bi Xia Yuan Jun, and I was the wife of the West Sea Dragon King. Now I want to go back to the East China Sea, and Jiang Ziya is in my way. I wanted to take advantage of the storm, but considering Jiang Ziya's noble merits, I can't bear it! "

King Wen woke up and immediately summoned Jiang Ziya. Sure enough, a storm left from west to east.

People in unknown so think that the goddess Mount Tai saved them from the mire, and that she can protect all beings and should visit the temples in Kyushu.