For the last two years, my wife and I have been talking with members the Church of Jesus Christ of Latter-Day Saints. These conversations have been edifying and at the same time can be frustrating because it can seem we are talking past one another. Evangelicals use, more often than not, the same terms as our Mormon neighbors (local or otherwise). Grace, priesthood, church, salvation, merit, authority, standard works, justification, etc are all subjects that both sides share yet have a variant meaning compared to the either camp. To alleviate this, one must dig into books that have both views represented by the best minds (that is to say theologians, biblical scholars, and the like) on either side of the dialogue. Here is a working bibliography that I have of some of the works you might consider reading yourself.
Blomberg, Craig L. and Stephen E. Robinson, How Wide the Divide?: A Mormon and an Evangeical in Conversation Downer Grove, IL: Intervarsity Press, 1997.
McDermott, Gerald R. and Robert L. Millet, Claiming Christ: A Mormon-Evangelical Debate. Grand Rapids, MI: Baker Publishing, 2007.
Millet, Richard L. Gregory C.V. Johnson, Bridging the Divide, Rhinebeck, NY: Monkfish Book Publishing Company, 2007.
Mouw, Richard J. and Robert L. Millet, Talking Doctrine: Mormons and Evangelicals in Conversation, Downer Grove, IL: Intervarsity Press, 2015.
If one, on either side of the debate, can dig into works that can bridge the divide between Evangelicalism and Mormonism, more fruitful conversations will appear. Consider the reasons.