What Is Eight Billion Demon Cultivators?

I am a demon cultivator. I have been reborn. One month from now, the zombie apocalypse, the immortal apocalypse, and the magical apocalypse will come one after another. This time, I will no longer live in an ignoble existence. I will hand over my demonic skills to the country!
I thought I would be rejected, but I didn’t expect—
“What a demon cultivator, I am the leader of the righteous path!”
Okay, okay, then I will become a righteous person.
Zombies? Resentful soul? This is not raw material.
What do you mean my Renhuang Banner is emitting black smoke? It’s because fellow Taoists are smoking inside!
Do you understand what the power of the Industrial Evil God is?
...
One year later, the end of the immortal world came. Thousands of demons lowered their heads from the clouds, and black smoke billowed from the eastern land. The demons were dumbfounded:
"We promised to be an ancient civilization, but how come you all have a Ten Thousand Soul Banner?"
"It's broken, we have become the righteous path!"