Find me the quote where a Protestant said that or forever admit you just declared a falsehood.
Walk into ANY Southern Baptist Church. I WAS RAISED HEARING ABOUT ONCE SAVED ALWAYS SAVED!
Why not check out http://www.av1611.org/etern.html. Some tidbits:
Our salvation is so secure even if we BELIEVE NOT after we're saved, because we become part of Him (the body of Christ
1 Corinthians 5 reports of an awful sin in the church. And even though Paul commands ". . . To deliver such an one unto Satan for the destruction of the flesh" Paul still speaks of that person being saved ". . .that the spirit MAY BE SAVED. . ."
With all the PROMISES from God to KEEP you, to SAVE you, to PRESERVE you to even suggest you could lose your salvation is to call God a LIAR!
Convinced? No? Perhaps these good people can help enlighten.