The Usefulness of Religious Unity

The Flowers Of Guidance Volume One Nine Instructive Steps to Gaining Knowledge Step 4: Light of knowledge
Followers of all religions will live in a brotherly and peaceful and serene and kind fashion.

What harm will it have for the followers of all religions, while maintaining their beliefs, to join hands, move according to the knowledge of their time, and progress towards the path of identifying Almighty God, ethical virtue and establish felicity and serenity in the world?

If followers of any religion consider themselves more progressed, they can discuss the shortcomings of their companions with a gentle and kind dialogue. They should maintain their general objective of theism and ethics; the followers of all religions will be encouraged to make progress in their time peacefully and kindly and advance the religious knowledge on par with the physical knowledge. On the other hand, if the followers of religion carry on bigotry and bias of the ideas in their religion against those of other religions, the strings of brotherhood and affection would shred, and all their energy will be wasted on dichotomy, conflict, dispersion, and strife. In this fashion, religious knowledge will cease to advance, and the caravan of theism will drop behind the contemporary knowledge tremendously, retaining the theists in the most recessive position.

Do you see anything wrong with everyone in the world being united, pursuing the God they worship?