The Root of Bitterness

After listening to the entire audio series of the previous post it's apparent that many Arminian doctrines have overrun our church's almost overnight as Baptist pastors continue to drift further away from the foundational doctrines that the Baptist faith was originally founded on, and I wonder what is the driving force behind this self-willed movement of this freewill debate and where does it originate from? I came across this quote by Horatius Bonar and thought it really exposes this freewill doctrine for what it truly is.

"In all this opposition to the absolute will of God, we see the self-will of the last days manifesting itself. Man wanted to be a god at the first, and he continues the struggle to the last. He is resolved that his will shall take the precedence of God's. In the last Antichrist, this self-will shall be summed up and exhibited. He is the king that is to do 'according to his will'. And in the freewill controversy of the day, we see the same spirit displayed. It is Antichrist that is speaking to us, and exhorting us to proud independence. Self-will is the essence of anti-christian religion. Self-will is the root of bitterness, that is springing up in the churches in these days. And it is not from above, it is from beneath. It is earthly, sensual, devilish." - Horatius Bonar (1808-1889)