With firm logic and abundant Scriptural support, Fr. John MacLaughlin challenges the claim that all Christian denominations are equally valid if one is sincere. Examining the error of indifferentism, he argues that Christ revealed definite truths and founded a visible Church marked by identifiable characteristics. By exploring apostolic teaching, the need for doctrinal authority, and the marks of the true Church, this book invites readers to seek the fullness of the Faith Christ intended and to consider carefully the implications of religious choice for salvation.