Cofty by all I meant all who accept Jesus Christ. Belief in Christ can save anyone from death. (I am sure you know this from the Bible). But why would anyone reject the free gift of everlasting life if they fully understand the idea of redemption and that Jesus died insted of us so we can have everlasting life?
And by the way, there are christian denomimations who understand that all you need is faith, believe and confess Jesus as Lord - aka the Son of God and redeemer of mankind. - Romans 10:9
They also say that true baptism is baptism in the holy spirit that you receive invisibley when you believe. When you truly believe in your heart and accept Jesus you are born again from God. You become child of God.
And there also are some denominations that say that you can not lose your salvation, since birth can not be undone. You remain your Father's child no matter what. Plus, they say all christians are a part of the body of christ so they say the body of Christ can not be amputated.
The reason they say this is because this was revealed in the sacred secret, after the resurection of Christ, it was revealed to Paul. He is the one who talks of the sacred secret. And they say we now live in the administration of the sacret secret. Salvation is by faith and grace now, unlike the mosaic law when it was by works.