I do agree with OSAS for some but I have to wonder about others. I am not sure that we should conctete of flag pole on either side of this issue. Many say it is either this way or that and there are no two right answers. I think each of us need to search our hearts and see if and why we serve God.
I know many like my grandmother that once she accepted the Lord as the head of her life she never left His side. I also know some that when trials and temptations came they jumped ship.
Were they ever saved, are they still saved? Only God really knows. For us to tell them they will never lose their salvation we could be helping them to decide they are okay without making the stands they should be making and it would be bad if they are found wanting in the day of judgement and they point at us and say he said "...".
We know that if we are serving our Father out of Love then there can be no fault found in us and we will never lose our salvation. That is for sure. We can take that to the eternal bank without fear of judgement.
I was at a conference with Jimmy D Young once and he said his biggest problem with his kin folk's book Left Behind was that they teach that we will have another chance during the Tribulation. He said he would rather teach that they won't get another chance and they do, than teach that they will and they don't. Wise words if you ask me.
The thing that we have to make sure is that we don't teach folks to question their salvation if they are trying to serve God or to teach them they have to ..... to keep their salvation. As you said in an earlier post. We can't do anything worthy enough to get it and it is not what we do that keeps it. Our salvation is based on faith thru His grace alone.
Romans 5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: 2 By whom also we have access by faith into this grace wherein we stand, and rejoice in hope of the glory of God.
If you have faith in Him you have eternal life. If you do not well...