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This Trinity Foundation website says "Last year The Trinity Foundation published Paul Elliott’s book, Christianity and Neo-Liberalism: The Spiritual Crisis in the Orthodox Presbyterian Church and Beyond. That book examines in detail the false doctrine of salvation now being taught in the Orthodox Presbyterian Church

The above website says

Thus, the Report continues the conspiracy of silence that has prevailed in the OPC for three decades. It leaves the erroneous impression that the serious doctrinal problems are outside the denomination, not within it. The Report gives false comfort to those who think the OPC is still a bastion of Biblical orthodoxy. On the contrary, the Report, and the 2006 General Assembly’s commendation of it, both maintain the OPC as a safe haven for those who teach error

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Men within the OPC, including at least one member of the Committee itself, teach heresy regarding the Gospel and many other fundamentals of the faith.

you can read the details at the link on page 109 why the Former Orthodox Presbyterian Church (OPC) ruling elder Paul M. Elliott says that

Satan has won his war of attrition against the one true Gospel in the OPC (113).
and The OPC long ago ceased to proclaim the one true Gospel to the exclusion of all false gospels (115).
and The Orthodox Presbyterian Church has abandoned the marks of a true church of Jesus Christ (118).

Why does a former ruling elder of the OPC say that? Well, he gives his reasons in his book about the heresy that he believes the OPC is following and he is urging every OPCer to leave. You can read it too if you want -- and if you disagree with him, he's given his posting and email address in the book. accordingly.

The author’s thesis is that the Orthodox Presbyterian Church (OPC) is today exactly where the PCUSA was back then.