When I was saved, I was saved from sin, from a sinful and wicked world and its lifestyle, and to eternal life and forgiveness of sins in Christ. IOW, I trusted Christ as my Savior and my life changed. I never heard of the doctrine of eternal security or OSAS until three years later when I went to Bible College. I wasn't saved through a Baptist church. However, when I was saved I was immediately shown how one can "be assured of their salvation." The Bible says we can. Having an assurance of one's salvation is a wonderful thing. Later on I came to know that "being assured of one's salvation" is basically the same as "eternal security."
If Christ gave me eternal life then it is eternal. If it stopped at any time then it wouldn't be eternal, but temporary, and Christ would be a liar.
There are no sacraments in the Bible, but as has been rightly pointed out, only ordinances--two of them--baptism and the Lord's Table. Neither one of them are means of grace, but commands to be kept.
I come from a Catholic background and I see the folly of sacraments and sacramental grace. It is not in the Bible or taught in the Bible. In fact that type of teaching is contrary to Biblical teaching. It is deeply rooted in a works-based salvation--a message that Paul called "accursed." For that very reason I left the RCC. Those who taught its message were accursed of God (Gal.1:8). I would rather follow the Bible instead.