Answer:
In those three European powers, religon played a significant role in aiding the expansion of their colonial empires.
This is because the population of those countries, including their rulers, was majority christian, and as a result, the church had a great degree of power.
However, there are two important differences.
The fist is that while France and Spain are catholic countries, Britain is not. Britain became a protestant (anglican) country under the reign of Henry VIII, and as a result, the final religious authority was not the Pope but the Archbishop of Canterbury.
The second difference is that the church was more powerful in France and Spain, because Britain had already gone through some liberal reforms that were gradually separating the Church and the State.
