And as the other posters have mentioned, the verse says nothing about their knowledge being from salvation, rather, the verse says only by their knowledge that they escaped.
These:
[Mar 4:4-6 KJV]
4 And it came to pass, as he sowed, some fell by the way side, and the fowls of the air came and devoured it up.
5 And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth:
6 But when the sun was up, it was scorched; and because it had no root, it withered away.