If it were not for Luther you would not have your Westminster Standards. Also the Westminster Standards have been modified since they were originally promulgated, have they not? Under what authority were they modified? Indeed, under what authority were they promulgated?
If the drafters of the Westminster Confession or (Calvin or Luther) were not led by the Holy Spirit, then they had no authority whatsoever to set down any standards. They might as well have just closed their minds and bowed to the Pope.
I don't know about "closing their minds," but now you're getting close to the fundamental problem I have with Protestantism. How do I know that the drafters of the Westminster Confession were led by the Holy Spirit, and the Council Fathers of Trent (or the ancient Fathers of the Church, most of whom have dramatic disagreements with one or more tenets of Protestantism) weren't?
Because I read Westminster and find it more agreeable, or more persuasive, or more in line with how I think I understand Scripture?
All that does is set me up as the ultimate arbiter of truth, and if I'm going to do that, I don't need a Bible, a Savior, or a Westminster Confession. Just me, and the "god" I've created in my own image.
I would say it was Calvin's theology from which the Westminster Confessions were drafted.
Also the Westminster Standards have been modified since they were originally promulgated, have they not?
It's my understanding that small parts of the Westminster Confessions have been modified over time but the general work of the Confession remains in tack. I have read through the Westminster Confession, the London Baptist Confession and several others. There is little differences between the main points.
You will be hard press to find a more complete and thorough understanding of Protestantism then the Confessions. You will also be hard press to find anything similar in all of Christiandom. I would recommend all Protestants read the Confessions of our faith.