The effort to enter that rest is not about works salvation, but entering that rest through faith in Christ/believing the gospel. Their disobedience in Hebrews 4 was a manifestation of their unbelief. You think this is ALL about YOU.
So you are saying having faith in Christ/ believing the gospel is an effort and that effort is not ours.
So to you God does everything including believing the gospel for us. Trying to legitimize a false doctrine is no joke, i can see.

Effort by any stretch of imagination means work.