After reading “Inside Mormonism” (which I have, very interesting), you may like to read “Catholic Roots, Mormon Harvest” by Eric Shuster, which tells the story of a Catholic couple that became Mormon, as well as a comparison of beliefs on 40 issues.
You should also have, for Catholicism, the Catechism of the Catholic Church, and for Mormonism, Gospel Principles. Both are available online. You may also be interested in “Theology and Sanity” by Frank Sheed (Catholicism), and “Latter Days” by Coke Newell (Mormonism). Other books that I have on both religions that I would recommend are (note that these books are not critical but are books by faithful of the respective religions. Inside Mormonism and Catholic Roots, Mormon Harvest are critical books):
Catholicism
-A Father Who Keeps His Promises: God’s Covenant Love in Scripture by Scott Hahn
-Swear to God-The Promise and Power of the Sacraments by Scott Hahn
-Why Do Catholics Do That-A Guide to the Teachings and Practice of the Catholic Church by Kevin Orlin Johnson
-Upon This Rock by Stephen Ray
-The First Seven Ecumenical Councils by Leo Donald Davis S.J.
-Jesus of Nazareth by Pope Benedict XVI
-A Biblical Defense of Catholicism by Dave Armstrong
-Signs of Life:40 Catholic Customs and Their Biblical Roots by Scott Hahn
Mormonism
-The Inevitable Apostasy and the Promised Restoration by Tad Callister
-Leap of Faith by Bob Bennett
-Where Have All the Prophets Gone? by Scott Petersen
-Of Faith and Reason by Michael Ash
-Exploring Mormon Thought (Vol 3)-Of God and Gods by Blake Ostler
-By the Hand of Mormon by Terryl Givens
-When Souls Had Wings-Pre-Mortal Existence in Western Thought by Terryl Givens
-Opening the Heavens: Accounts of Divine Manifestations, 1820-1844 by John Welch
The Mormon equivalent of this forum is:
mormonapologetics.org/index
You should of course also be reading the Bible and praying. When looking at critical information on either religion, you should also see if members/apologists of that religion have responses to those criticisms, since “anti” material is quite available for each. Look at the Biblical passages cited in support of all of the sides. You should also read the writings of the Early Church Fathers, which are found online (
newadvent.org/fathers/). It may be difficult at this point to actually read them, but you will encounter them in your readings, so it may be helpful to go back to the work and read them in context.
I hope that was helpful for you.