I know a lot of people cannot -stand- Calvinism, but...
when it comes to Total Depravity, I think they're pretty much spot on. Even the most hardcore Pentecostal I know will admit that Jesus has to "deal with your heart" before one can become genuinely saved. to me...
Scripture is fairly plain that human nature is bad from birth, and we just get worse over time, barring divine intervention. The OT Law helped create a functioning society and outwardly moral, righteous people...
but lacked the power to -save- from sin, at all levels. As Christians, we've (thankfully...) been grafted onto the tree, and we have been saved from: sin (and...satan, self, death, and the world) in and thru and because of Christ Jesus, and Him Crucified (I'd argue and Him Resurrected, also...but whatevs...).
I personally didn't get saved until 28, after a wasted existence ("life"). Odd as this may sound, I find the NT condemnation of unredeemed human beings...if not "comforting," then at least...helpful, because I see it in who I once was, chunks of who and what I hold onto, and--speaking as a weakling only fairly recently made remarkably whole, albeit flawed and frail--lots of "respectable," even "good" people all around me.
and I lean towards Calvinism 101 (NOT an expert at all, nor am I trying to act like one) and TULIP because...
personally, getting genuinely saved required some divine intervention for me...and the events that followed I see now as God's work.....so...
I don't think its un-Biblical to support the (more) Calvinist interpretation of mankind's natural state, and I honestly don't see why some Christians find elements of Calvinism (because I think one can support parts of TULIP, Sprouls' teachings, etc. without becoming a card carrying Presbyterian....) so utterly repugnant. Human beings are wretched. That would explain widespread poverty in the face of plenty, The Holocaust, abortion on demand, and all sorts of violence and cruelty. Only God can get a wretch to see the light...in the form of The Good News. makes sense to me, at a number of levels (real world observations and Scripture, together...). God knows, long before we do, who is His and who is not. Not exactly compatible with (post)modern society's faux egalitarian sensibilities, but...
is it True? I think+believe so, yes. I honestly do, sometimes more so than others, but increasingly....yes, yes, yes. I do not think a human being can rationally call Jesus Lord...I think God has to intervene, and I think He does it for The Elect.