Puritan Board Junior
Can we say something about our religious affiliation without implying something about our God?
Neither Calvin nor the Westminster Divines were architects. They found the churches, they didn't construct them.
And they didn't have to preach, worship, or meet in those buildings if they thought they were sinful places to gather. I don't remember Calvin or the Assembly complaining. And isn't it ironic that the body held responsible for such a clear confession which clarified the RPW, did not say a word about meeting and worshipping inside a cross.
Ironic or not, it should be noted that those places of worship were simply following the usual Papist form of building churches in the shape of a cross. The construction of each of those churches was prior to the Reformation, so it's not as though they were built in the cross shape by those who held Reformational views.
The Reformers fully knew the construction and form of the building they were using. By consciously using cruciform buildings, they were tacitly showing that it was a matter of indifference. Nothing forced them to use those buildings. I only brought up the architecture to show that exterior crosses on or of a church obviously were not considered sin by Calvin or the Westminster Assembly.