The annihilation of distance through the achievements of Modern World technology has brought all the living great religions all over the world into a much closer contact with one another than ever before. A World Civilization which is actually in progress has become a part of our daily life. Amidst this momentous world wide progress, we are encountering the challenge of the concept of 'religious tolerance' increasingly held in our time. Evidently this challenge is brought forth primarily by the pluralism of religious loyalties, since most of the religions have respectively claimed a share of the truth. It is therefore the objective of this book to investigate and analyze contemporary challenges and merits of the 'concept of religious tolerance' to the adherents of religions.