First, I am glad you finally concur that the Old Covenant included children. Maybe we can even say circumcised children? But, I am rather disappointed that you think that none of the Old Testament saints were saved? The Old Covenant looked forward to Christ and we can be assured that the saints of the Old Covenant were saved (Heb 11, et. al.). Circumcision did not save, but to say that there is no economy of salvation under the Old Covenant is false. The Old Testaments saints entered the economy of salvation by faith. They could look back to their circumcision as a sign and seal of the eternal Covenant God had made with them. Prior to salvation they were a part of the covenant (visible/invisible church distinction).
Where has Steve even hinted that he believed that the OT saints were not saved! This only adds fuel to the fire. This subject already causes enough divisions among brothers without deliberately misrepresenting another's views!