I was taught the same thing, that the WCF improved upon the 3 forms, that it is more complete.

It is mostly the Dutch or Continental churches that use the 3 forms and the ones I know don't seem as fond of the WCF. Whereas the WCF is predominantly used by Presbyterians.

I believe the 3 forms was written by the Dutch area churches and the WCF committee was mostly Presbyterians.

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Erick Bohndorf, Covenant Baptist Church, KS
http://qayaqtraveler.blogspot.com/
The question for us today is, will we be like the majority of Israel and continue to look in fear at the giants in the land and urge our fellow Christians to be "realistic," or will we be like Joshua and Caleb and faithfully follow our king, trusting to fulfill every one of his promises completely?