John 10 There are 11 Old Testament scriptures prophesying Jesus as the Great Shepherd. No man cometh unto The Father, but by me.
Salvation can come no other way.
Those who try to enter by ways other than The Door is likened unto a thief and a robber. Thus, Striving for salvation through ways other than Jesus will not do it. It only presents more evidence of the lost man's condition. The Holy Spirit is the porter, the doorkeeper that beckons and calls all to the knowledge of Christ. The sheep know His Voice.