My sincere thanks to reader John J Flanagan, who has kindly taken the time to discuss his experiences in the Orthodox Presbyterian Church (OPC) and the Lutheran Church Missouri Synod (LCMS).

His guest post follows. Please feel free to comment or ask him questions to which he can respond directly.

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What are the differences between the Orthodox Presbyterian Church (OPC) and the Lutheran Church – Missouri Synod (LCMS)?

I freely admit I am not an expert and certainly not a theologian, but I would refer interested parties to read for themselves the websites and Q&A sections on this topic posted at both the OPC and the LCMS websites.

I was a member of an OPC church for a few years, and eventually returned to the LCMS. Prior to that I was on a spiritual journey after 40 years as a Catholic, looking for the truth of God and His word first in the Bible, than checking out various denominations, like Baptists, non-denominational, Reformed, and OPC and PCA. I had been a member of an LCMS congregation as well, but I felt so confused by the varying interpretations each denomination had that I could not be sure in which church I belonged.

The OPC is a solid and faithful church, in my view, but I do not agree with all of the doctrines taught. First, the positives: Sola Scriptura, noting as the Bible declares that we are saved by grace alone, through faith alone, and by Christ alone, apart from any works. The OPC believes in infant Baptism, as do Lutherans. End times: Lutherans are amillennial, however, while most OPC ministers are amillennial, some are Post Millennial. The OPC tends to regard communion as a memorial or symbol but Christ is present by His spirit, while Lutherans believe Christ is bodily present at the sacrament. The OPC and LCMS also views Baptism differently, in the sense that Lutherans believe one is regenerated or born again, while God does not necessarily regenerate a person being Baptized, although it is within His sovereignty to do so.
The OPC views Law and Grace differently than Lutherans. The Reformed view is that the Law is designed to suppress wickedness and promote righteousness, whereas, the Lutheran view is that the Law leads us to Christ and repentance.

This is a thumbnail sketch. I have often been struggling with varying interpretations that sincere and God loving Christians apply to the same scriptural verses. It can be confusing, but I have found that Lutheranism explains scripture better, in my view, and the OPC and Reformed lean heavily on the Westminster Confessions. In any case, I suppose Our Lord will determine which church reflects the most accurate interpretation of these things.

Those of you interested in understanding the various denominational teachings should read further materials, but the first and primary way to do that is to keep your hand on the Bible as you read, and pray for wisdom.

I must add that the OPC is, of course, Calvinistic. It follows the five points of Calvinism, also believing in double predestination, which Luther rejected. Other differences, like the Presbyterian form of government, the simplicity of the worship service, rejection of icons, set it apart from Lutheran traditions. The OPC has about 300 churches and about 30,000 members. On the plus side, they rejected post modernism long ago, and split from the very liberal Presbyterian Church USA (PCUSA), as later did the group which formed the Presbyterian Church in America (PCA). But having looked at this as closely as I am able, in my humble opinion, the LCMS is where I shall remain, and I pray that we remain faithful in the years to come.

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