And just to return to where I started. Let us all reflect for a moment on the dramatic significance of Grudem’s claim about eternal generation. What he is saying is that the church catholic has for over 1600 years been affirming theologically and liturgically, as the key ecumenical summary of its faith, a document – the Nicene Creed – which in one of its core and defining assertions is superfluous or virtually meaningless or confused (or a wax nose which means whatever any Christian chooses).
Keep in mind that I don't subscribe to the eternal subordination of the Son. That said, Trueman is using exactly, and I do mean exactly–the same objection that Roman Catholic and Eastern Orthodox apologists use in reference to the Protestant faith, viz.
"Consider for a moment the dramatic significance of your claims. What you are saying is that for 1600 years, God allowed the Church to go astray until Luther and Calvin popped in out of the blue!"
How can Trueman be so blind?