Yes it is, because it was created in the 16th Century by the Protestants, mainly, a man named Martin Luther. Not only is it ironically "man-made," but it is also un-Biblically sound.
The Word is complete, but it is not the sole source of authoritative teaching and doctrine--the Apostles' left us their oral teachings and examples as well.
Wrong. This is why I doubt you've read your history, even Protestant history. Find anywhere in Christian history or Christian theology prior to the 1500s where this is true.
Again, you speak ignorance. Scripture is indeed God's Word and infallible, but the Scriptures do not say or teach sola scriptura. In fact, the Apostle's themselves in the Bible tells us to hold to their traditions, whether they be written, by word of mouth, or example. The Apostles gave us both Scripture and Apostolic Tradition.
Non-denominational is still, ironically, a denomination.
Who are you to say that the Calvinist is wrong and interpreting with a carnal mind versus your interpretation? How do you know? This is the problem with the circular argument of sola scriptura and private interpretation.
Actually, they are very logical and I even provided solid examples of why sola scriptura doesn't work. You just choose to ignore them and throw out Scripture verses. There is a problem with saying that the Bible is the sole rule of faith, the sole interpreter of faith, when Christians bring two conflicting interpretations (both "led by the Spirit")--which one is right?
Is the Calvinist right about free will or the Methodist?
Are the Quakers right about baptism or the Evangelical?
Are those who identify Jesus Christ as Michael the Archangel right, or those who believe Christ is the Second Person of the Trinity and full God right?
You say they are interpreting with carnal minds, they will tell YOU the same thing. Being non-denominational doesn't mean you're any more in-tuned with correct Bible understanding or interpretation. Non-denominational Protestantism is still Protestantism with Protestant roots.
Sound Scriptural doctrine? Wow, with 40,000 different ideas of "sound scriptural doctrine," you're going to have to narrow it down and tell me which one it is.