I speak for myself but probably for all open theists that I know of: we do not believe or teach that man achieves or deserves his own salvation. Our salvation comes from Christ alone and is the gift of God.
The many who falsely accuse us are just inventing falsehoods to smear the good name of open theists and should shut up.
Believing salvation comes from Messiah alone and is a gift from Elohim is very different from having received that salvation.
I would suggest, that post Calvary, even Satan and his hoards knew and believed the same thing as does B57 and his puppet.