“God knows who will or will not believe.”
Alright, if He knows who will or who will not believe then the “whosoever believeth in Him” really applies to those He knows will believe otherwise God is just tantalizing the unbelievers.
But since it is foreknowledge, rather than God choosing, the men who reject Christ do so on their own volition and to their own doom.
It remains true then that “Whosoever will...” MEANS whoever will, not “Those I have chosen and secretly given life to...”
And we remain saved by grace thru faith rather than grace thru election.