There's an old saying "hope for the best, prepare for the worst" something along those lines.
I agree with Jack. Rumors of war are an old tactic for distraction from more urgent matters such as vaccine death and removal of rights/constitutions and also to instil fear in the population which is then channeled by the same beings that create such rumors in the first place.
A world war would benefit no one, not even the enemy. I wouldn't call it impossible though, as they may pull it as a last resort, to bring everyone down with them. But we are to be hopeful that it wont come to that. As the enemy should be dealt with before it gets that bad. Also, if you are doing your job as a Satanist, you should have your own protections up. The Gods also take care of their own.
Do what you have to do to get prepared, physically and spiritually but don't dwell much on it because thats the whole purpose of these rumors of war.