Below is a brief thought on a practical implication of how justification by faith alone helps to differentiate Christianity from other world religions.
Most world religions have a component of a works-based justification built into them. Evaluating such religious systems outside the revelation of the Christian Scriptures would call for an honest appraisal of one’s works. In this type of appraisal would be shown the constant shortfall of such works to justify anyone in any light, especially, before a holy, divine creator. This type of religion would have to continue adding more works to the previous works that were not sufficient only to be defeated in a vicious cycle.
The important Scriptural doctrine of justification by faith alone helps to set the truth of Christianity further apart from such works-based religions. In a practical sense, justification by faith more clearly shows the uniqueness of Christ and His justifying gracious work on the cross to save sinners. If Christianity only offers another works-based religion slightly different than the others then it has nothing in reality to offer.