I never said Calvinists did.
The truth is, no one can know the fullness of the mystery of God. I should probably have said "Scriptural" rather than "Spiritual." Oh the joys of semantics
The Quran has many teachings that are in line with the Bible. It is not 100% accurate, but I have learned things from Muslims that go right in line with what Scripture teaches.
My view is not liberal in the slightest. I don't know where you got that idea from All you have to do is go through my recent post history and you can see that. I believe God hates divorce, I also believe that homosexuality is sin. I believe we were much better off 50 years ago when people just accepted it rather than trying to set the Bible against itself and refute it.
What I meant when I said that one can find Spiritual (Scriptural) lessons from any source is that God uses everything for good, even what satan does. I meant that secular movies and literature have SCRIPTURAL lessons in them, but it takes a child of Christ to see that. I meant that one should never discount EVERYTHING that comes from a certain source just because one or two things in it are flawed, because EVERYTHING on earth is flawed. We live in a fallen world.
One should always be open especially to the things another believer has to say, whether they be Catholic, Baptist, Lutheran, or even Mormon, because with a spirit of discernment one might learn something they never knew before.
What I meant when I said we can never know the fullness of the mysteries of God was that we can't. Plain and simple. If you believe you have all the answers, you end up missing out on what God wants to teach you, because as long as you breath, there will ALWAYS be something to learn.