???
Condemnation most certainly does not rest on unbelief! What a foolish thing to write.
A person is not condemned because of unbelief, he stands already condemned because of sin.
Romans 6:23 — English Standard Version (ESV)
23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
You are totally and I suspect purposely missing the simple truth of Mark 16:16.
Jesus states salvation is through belief and baptism.
Condemnation is mankind's state because of sin without belief and baptism.
Hence the existence of such verses as Acts 2:38, 1st Peter 3:21, Acts 22:16, John 3:5 etc.
We
may debate what constitutes "believes and baptism" but
not the need for both of them.
If we can twist such a straight forward verse as Mark 16:16 then nothing is safe.