Since I started this thread, just a short note:
It seems like there have been (still are?) some accusations being flung back and forth. I am not going to try to resolve the matter: probably wouldn't help.
I think we can debate the issue of eternal security and of the role of faith, grace, and works without having to get defensive or angry or defamatory. And I personally don't think it is biblical or correct to presume the person with the opposite view can't be a Christian or has the wrong gospel.
Either side could presume that the other side is heretical if they don't listen to what the other side says: I have sometimes wondered if some of the things flung back and forth are even read by the other side?!
The gospel (good news) is salvation through the death and resurrection of Jesus Christ. That is the central core of the good news. I think most OSAS and "anti OSAS" people will affirm this core part of the gospel.
Do we disagree on the details? Sure -

I am still looking for someone to give a verse that clearly states "once saved always saved"? Haven't seen one yet!!!