Many denominations that claim to be Reformed are so only on paper. The one you mentioned, for example, claims the Westminster Confession of Faith as its standard of doctrine and practice, yet as you see, in actual practice they deny it.

The same can be said of many other denominations and individual churches. One needs to look beyond the paper and see the actions taken by church courts, committees, position papers, and publications. It takes some time and a bit of digging, but it's important and very enlightening!