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Originally Posted by shackleton  The Methodists and Lutherans still sort of hold to the RCC idea of infant baptism and I know seems like the most biblically consistent doctrine but was wondering if it was Calvin or someone else who popularized it. |
I don't know what you mean by Methodists and Lutherans holding to the RCC idea. I know Lutherans definitely do not hold to any Sacerdotal system of infused grace.
From what I understand, historically, we can't necessarily attribute all the main Reformed ideas to Calvin. Bullinger and Martyr were contemporaries of Calvin that helped shape each others' understanding of the Sacraments. Calvin is a giant but, unlike Lutheran theology that clearly has the stamp of Luther/Melancthon, Reformed theology developed from several men.
I think it's safe to say that Federal theology (aka Covenant Theology) was historically the most systematic presentation of God's Covenant dealings with man to that point.