"God" has only stepped into this realm and interrupted the "free will" of mankind a handful of times in human history. And even in these moments "He" did it with the help/ permission of a willing human agent.
The realm of earth has rules that all beings are bound by. Neither "God" nor "Satan" (Good nor evil) are allowed to interact in this domain without permission from a human.
The death of Anton LaVey was one such time. The true story of his demise is very well buried but the truth is out there. Anton was behind many many evil things (including the rape of children) but "God" only stepped in when the consequences of his actions were just to high to allow him to proceed. And even then it took human agents asking for "His" help.