What happened in the End ? (spoilers)

[Wilder]

Recently I found that my vision of the ending of VII Was Wrong, I tought that casting Holy would kill everything and everyone in the planet, and there is all this scene of holy stoping meteora, and ... washh, no more.only a scene of midgar buried like a green jungle. I thought " Everybody´s die !, amazing ending !". Recently I Found with Advent Children that they´re alive, It cant be, I supossed that the movie is gonna be developed in the way how Holy kills every Being in the planet , and maybe that scene of Midgar avandoned is an image after the events of Advent Children. It´s just spinning in my head, please help me solve the puzzle.