Charmed Season 8 Discussion!?

I was re-watching season 8, and the logic behind the whole season has always bothered me. The first point that sticks out like a sore thumb is the timeline. Christy Jenkins was kidnapped when she was 7 years old. that was long before the sisters even reactivated their powers and became the Charmed Ones, but she was kidnapped to stop the Charmed Ones, who at the time were not even a thing. The second point is even darker. The "good" side had years to intervene on behalf of an innocent child, Christy, before the Charmed Ones were even witches. Instead, they waited until the demonic plan was complete, then punished the sisters for being unmotivated, and changed Leo's destiny to die or be taken to give them the motivation to fight. If the angel of destiny was willing to interfere here and change a person's destiny to die, why not change one to live or not be taken, or to be saved way before the conflict?

This season really has nothing to do with the Charmed Ones, Christy was taken way before they were witches, and the so called Celestial beings that were supposed to be neutral puppeted the whole thing.

sidenote: What would have happened if the sisters had given up their powers when they had the chance?