God's plan of salvation means nothing at all? That's a pretty big claim.
Without all of God's Word, as in
when anyone rejects His Warnings
(to the disciples and all those following Y'SHUA and YHWH)
which in Scripture Jesus gives or talks about stern warnings of judgment more than talking of or about heaven,
they who reject His warnings are left without TRUTH - with empty / vain hope -
because they rejected God's Word
hoping a false hope for Salvation, for God's Blessing,
without honoring Him, without actually believing Him,
without honoring or trusting His Word.
Thus the "bless me club" - calling "Lord, Lord" but not even knowing Him,
not obeying Him, not destined for Salvation as HE Says in His Word
- a stern warning to everyone to never ignore His Word....