Necromancer: Become a God from Belief in the Holy Light

Came back through time, with dual career panels of Paladin and Necromancer. The system allowed him to become a god step by step starting from gaining his first disciple, but he had just witnessed the death of his teacher, experienced the betrayal of his best friend, and was about to die, so there was no time left. Forget it, let's summon a skeleton soldier first to save our lives. "Huh? The undead creatures I summon can also increase their faith?" ... The holy light splits the eternal night like a sharp sword, and Roy hangs high in the sky. The sea of ​​bones knelt down suddenly, the giant dragon lowered its head, and its spine was as low as a mountain. The torrents of light and death intertwined, faith boiled, and gathered into a vast ocean, lifting up the new-born gods. ... The noble and holy female paladin Cornelia is contaminated by the God of Desire and is about to degenerate into an irrational vessel. At this moment, Roy had two choices before him. Option 1: Believe in the Holy Light, make Cornelia her disciple, and use the Holy Light to expel the pollution of the God of Desire. Option 2: Undead Transformation, transform Cornelia into an undead creature, and you will gain a death knight who will always be loyal to you. Roy was in a dilemma, which one should he choose?