Recently, my friend Hanna Seariac and Aaron Shafovaloff had two interactions with one another, touching upon many areas of Latter-day Saint vs. Reformed theologies (cf. An Examination and Critique of the Theological Presuppositions Underlying Reformed Theology):
There are many things one can note from their discussion, but I will limit myself to two:
Firstly, Aaron gives, as many Protestants are wont to do, an ontological answer to an epistemological question, that is, how he knows the Bible to be true and the books contained thereof are part of the canon. Of course, Aaron believes in the (ironically, anti-biblical) doctrine of Sola Scriptura. For more, see Not By Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura
Secondly, Aaron desperately dodges how Calvinism makes God the author of sin. On this, see Aaron Shafovaloff and how Calvinism Makes God the Author of Sin and God Never Sinned? According to Calvinism, He Sins/Lies All the time In the Act of Justification!