I had grave doubts about reformed thought, Grace, and Sola Scriptura that were deep enough to bring me to RCIA (Roman Catholic Initiation classes) , God, turned it to Glory. I by questioning Luther and Calvin, was able to challenge ALL my presuppositions. It made me stronger, the Catholic Church could answer the deep things. I turned back to Scripture, with a focus on Hebrews. It was as if a cloud lifted. As my friend Matthew Winzer noted it is not about "Calvin" but about what IS Christianity. It may seem I am not giving an answer, perhaps I am not, other than this, God can "handle" questions, God in His Providence will guide the honest Christian "seeker" to truth. (No I was not using seeker as it is tossed about in current Christian circles.) I mean what I mean, HONESTLY looking. God knows His own. He will guide you to truth as Truth is a part of his very aspect. Grace and Peace.