Nowadays, it is noted that economic development in most countries is accompanied by desegregating in the human relations. It’s argued that this phenomenon is due to the absence of true faith and good morals in the efforts of development. The goal of this paper is to verify the hypothesis saying : “ The inclusion of true faith and good morals in the efforts of development in both ancient and contemporary society of Saudi Arabia led to more closeness and unification among it’s parts and people”. The paper dealt with the period before Islam in Peninsula and showed that the absence of true faith and good morals was accompanied by fighting of people and spread of hateness and grudge among them. The period after Islam was examined and the analysis showed that whenever people followed the instruction of Islam and applied them in their life, the efforts of development resulted in unification of Muslims. It has been shown that because the efforts of development were accompanied by applying the instructions of Islam during the contemporary age of Saudi Arabia which started in 1932 , these efforts resulted in more unification among it’s parts , and more closeness and integration among it’s people.

Polygamy is a practice that has been heavily, frenziedly and ceaselessly assailed by orientalists to call great Islam into serious questions and malign its honest messenger Muhammad. Polygamy was verbally attacked as early as the era of Prophet Muhammad himself, when Jews attempted to cast doubts on the validity of the system.