The term "dead religion" refers to a belief system or religious practice that has lost its vitality, relevance and significance in people's lives. Full definition
Trying to be sure of what He is doing results in dead religion because we expect Him to do what we think He ought to do. (redeeminggod.com)
But we need to fill the void and tell of the real Christ, free from all the baggage of dead religion and historical corruption, in his pure, loving and powerful position as God. (premierchristianity.com)
Christianity will eventually become a truly dead religion just as Latin is a dead language. (religion.blogs.cnn.com)