The core and foundation of the Demon Path in this world is not about demons or evil, but destruction!
Where there is life, there is destruction; where there is a beginning, there is an end. Destruction too is a noble truth of the Righteous Path.
Therefore, within each Divine System, there are Gods of "Destruction" with extremely high status and enormous power. Among the Three Forms God of the Brahman Sect, Shiva is known as the God of Destruction and is also the Lord of the Future.
In the eyes of a Mysterious Gate cultivator, this Shiva would be considered part of the Demon Path, a true God of Demons.
However, the most revered deity in the Brahman Sect is still the preserver and protector, the current ruler—Vishnu!
There's no way around it, although destruction is true and death is a part of the cycle of life, resisting death and destruction is an instinct for all beings.