A useful but somewhat simplistic way of defining neo-orthodoxy is to define it as the rejection of Professor [[Wilhelm Herrmann]] teachings by some of his students—in this sense [[Fundamentalism|Christian Fundamentalism]] is a branch of neo-orthodoxy. For [[John Gresham Machen]], who traveled to Germany and studied with Herrmann in 1905, is a key figure in the formation of Christian Fundamentalism. Above all, the common ground between [[Fundamentalism|Christian Fundamentalism]] and Neo-orthodoxy is the acceptance and evangelism of the [[sin|doctrine of Sin]]. A significant difference is the solution to the problem of sin. [[Fundamentalism|Christian Fundamentalism]] espouses the [[Salvation|doctrine of Salvation]], while neo-orthodoxy remains eerily silent on such a solution despite all its vociferousness about the [[sin|doctrine of Sin]].
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A useful but somewhat simplistic way of defining neo-orthodoxy is to define it as the rejection of Professor [[Wilhelm Herrmann]] teachings by some of his students—in this sense [[Fundamentalism|Christian Fundamentalism]] is a branch of neo-orthodoxy. For [[John Gresham Machen]], who traveled to Germany and studied with Herrmann in 1905, is a key figure in the formation of Christian Fundamentalism. Above all, the common ground between [[Fundamentalism|Christian Fundamentalism]] and Neo-orthodoxy is the acceptance and evangelism of the [[sin|doctrine of Sin]]. A significant difference is the solution to the problem of sin. [[Fundamentalism|Christian Fundamentalism]] espouses the [[Salvation|doctrine of Salvation]], while neo-orthodoxy remains eerily silent on such a solution despite all its vociferousness about the [[sin|doctrine of Sin]].
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===Neo-orthodoxy and Reformed theology===
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Another way to categorize and define neo-orthodoxy is as a subset of [[Reformed Christianity]]. This was done by [[George M. Marsden]] and others in the book ''Reformed Theology in America: A History of Its Modern Development'' (Eerdmans, 1985).<ref>[http://books.google.com/books?id=S_ja7y27VYsC ''Reformed Theology in America''] (Google Book preview)</ref>