Why was the church the most important building in the mission?

The goal of the Spanish padres was to convert the native people of California to Christianity. For this reason, the church was the most important building in the mission compound. It was usually the first building constructed. At most missions, the church occupied a place of honor at the northeast corner of the mission quadrangle. It was always the tallest building in the mission compound.

Explanation:

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there were abundant sources of fuel nearby