Because religions are many, they cannot be trouble free. Not only this but religion is a bone of contention. Whenever there is truth, peace and prosperity there is Dharma. It is practically impossible in different religions. Looks forward for quality always.
Religions look forward for quantity.
Dharmic is he who is impartial and moral to all. It is too difficult to be impartial and moral with the people of other Religions and faiths. Laws of God or nature are always perfect in the Universe. Laws of any human being, however super he may be, cannot be perfect. Only god can be the prime source of all knowledge.