Final answer:
The vast growth of cyber-churches is not a major religious trend today when compared to other trends like the decline of Christian church membership in Europe, the rise in Christian membership in developing countries, the blending of religious practices, and the rise of Islamic religious nationalism.
Step-by-step explanation:
The question seeks to identify which option is not a major religious trend in the world today. Available trends include the growth of cyber-churches, decline of Christian church membership in Europe, rise of Christianity in the developing world, blending of religions, and the rise of Islamic religious nationalism. Based on the provided information and current knowledge, the vast growth of cyber-churches is the least discernible as a major religious trend. While technology is impacting religious practices, it has not replaced traditional religious gatherings on a large scale.In contrast, we do observe a clear decline of Christian church membership in Europe, known as secularization. There's also a documented increase in Christianity in developing regions, and the mixing of religious beliefs is increasingly common. Furthermore, the rise of Islamic religious nationalism is a significant phenomenon, particularly in regions with large Muslim populations. These trends align with sociological studies which highlight the complex nature of religious adherence and its evolution in contemporary society.