WHAT is an Old Testament Christian? The best test to find out if I am a New Testament or an Old Testament Christian, is to turn to the Book of Hebrews, chapters 9 and 10.
This section, first of all, talks about the experience of the Old Testament people, particularly about their experience with sin. It says that the High Priest went into the Holy of Holies year after year, not without blood, which he offered for himself and for the peoples sins committed in ignorance(9v7). It says that the sacrifices were symbolic but that they could not make him who performed the service perfect in regard to conscience(9v9). For it is not possible that the blood of bulls and goats could take away sins (10v4). They had to offer sacrifices continually year after year (10v1). The High Priest and the people were continually reminded that they were sinners (10v3). All the Priests stood ministering daily and offering repeatedly the same sacrifices, which could never take away sin (10v11).
That is the Old Testament experience, a continual preoccupation with and consciousness of sin. They were always aware that they were sinners.
Then we read about the experience of those who have received Jesus as their saviour, who have accepted His sacrifice of Himself, for their sins. It says that the blood of Jesus has purged( the American dictionary says that purge means to make physically and spiritually clean) their conscience from dead works to serve the living God (9v14). Jesus has put away sin for them by the sacrifice of Himself (9v26). Those who receive Jesus sacrifice for them have been once purged and have no more consciousness of sin (10v2). We are sanctified through the body of Jesus once for all (10v10). He(Jesus) offered one sacrifice for sins forever (10v12). We no longer need an offering for sin (10v18). God has no more memory of our sins (10v17). Jesus has perfected us forever (10v14).
The New Testament experience is that sin has been put away, there remains no more consciousness of sin, we approach God as perfect people (10v1)
The choice is ours. Will we be Old Testament or New Testament Christians?