There is no question that they are teaching eternal security, the question is if it is wrong or not. Yes I attend a "reformed Baptist" church.
Then I suggest you find a different congregation to attend. Most denominations that are derived from the Anglican, Wesleyan and Methodist branches of Christendom do not hold to eternal security. Some (Assembly of God, Nazarene) go so far as to remove ordination any pastor that tries to teach OSAS.
Having been raised in the Wesleyan tradition, I have never held to OSAS. However many believers I respect and support DO hold to that position. So I set off to decide for myself. It actually changed my belief of soteriology, not just this one point. And, as a Messianic, I see broad continuity between "old" and "new" Testaments. As an adult male Jew, "born under the Law," Our Lord could
not teach differently than the Law of Moses and remain the sinless sacrifice for our transgressions and sins.
I now see salvation as a matter of making a covenant, similar to marriage. Of course we all know that the covenant of marriage is
supposed to last a lifetime. But we all know marriages that have failed for any number of reasons. Likewise the Mosaic Covenant was to be adhered to for a lifetime. But we see written in several places that certain sins would "cut off" a person from both the Covenant and the People of God.
i.e. lose salvation.
And if it is a covenant similar to marriage, what about the divorce stipulations in the Law? In Deut 24 Moses wrote (from God's revelation) that there were stipulations and procedures to go thru to obtain a divorce. It could not be done without willful consent.
So, my conclusion was that Salvation is SUPPOSED to be forever, but can be lost. But that is not easily done. It was NOT (as my church background taught) lost every time you sinned, even if you were unaware of the sin. (for instance - accidentally smelling alcohol was considered the sin of drunkenness) It takes a decision to willfully leave the faith in order to lose salvation.
There is a confusing passage in Hebrews 6 where it says it is
impossible to return someone to faith if they fall away. Wesleyans and other Arminians cite this as proof scripture of losing salvation. Again, looking to the Mosaic writings, I find a similar text on marriage to shed light on it:
Deut 24:2
and she leaves his house and goes and becomes another man’s wife, 3 and if the latter husband turns against her and writes her a certificate of divorce and puts it in her hand and sends her out of his house, or if the latter husband dies who took her to be his wife, 4 then her former husband who sent her away is not allowed to take her again to be his wife, since she has been defiled; for that is an abomination before the Lord, and you shall not bring sin on the land which the Lord your God gives you as an inheritance.
So similar to there being no way back if she marries someone else, if someone leaves the faith and "is joined to an idol," i.e. worships other gods, there is no way back. And since the Hebrews book was written to Jewish believers thinking of leaving the Messianic faith, the parallel is obvious.