The hypothetical scenario of all the Crusades being "perfect successes" could be interpreted in many ways, depending on how you define "success."
If by "success" we understand the complete achievement of the Crusaders' goals (from the perspective of the Christian forces), this would imply the establishment of lasting Christian control over the Holy Land and perhaps a stronger influence of Western Christendom in the Eastern Mediterranean. However, this scenario would drastically change the course of history, with numerous potential implications:
Religious Implications: If the Holy Land had been under uninterrupted Christian control, it would have significantly affected the development of Judaism, Christianity, and Islam. The relationships between these religions might have evolved differently, potentially leading to different interfaith dynamics.
Cultural Implications: The Crusades brought about cultural exchange between the East and West, especially in the realms of science, philosophy, and arts. If the Crusades were more successful, this exchange could have been even more pronounced, potentially leading to an earlier Renaissance.
Political Implications: If Western European powers had established strong and lasting control in the Middle East, it could have fundamentally reshaped the political landscape of the region. This could alter the formation of modern nations and power dynamics in the area.
However, it's important to remember that the Crusades were also characterized by significant violence and loss of life. A "perfect success" might also have entailed further destruction and suffering.
This is an extremely complex hypothetical scenario, as changing one major historical event would have countless ripple effects throughout subsequent history. It's impossible to predict with certainty what the world would look like today under these conditions.
Lastly, the term "perfect" is subjective and may differ based on perspective. From the perspective of those living in the regions affected by the Crusades, such as Muslims, Jews, and Eastern Orthodox Christians, the Crusades being a "perfect success" may not be considered as such.
Therefore, it's crucial to recognize the inherent complexity and diversity of perspectives when considering hypothetical scenarios in history.