what is the possibility that this topic will lead to world war 3?
None.
The whole thing is much bigger than "just" the flat earth fact.
The next battle you have no say. You are degraded to cockroach style status and if its deceit-ed to terminate you so be it. The best you can do is not to pick up a weapon otherwise you end up in front line.
Not only is the earth round and not flat, but you are going to say it. Repeat after me:
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.
The earth is round; the earth is not flat.