I also find it quite immoral...i.e. having 4 wives, and Qur'an 65:4 with regards to matters of divorce :"And those of your women as have passed the age of monthly courses, for them the 'Iddah (prescribed period), if you have doubts (about their periods), is three months, and for those who have no courses [(i.e. they are still immature) their 'Iddah (prescribed period) is three months likewise, except in case of death]. And for those who are pregnant (whether they are divorced or their husbands are dead), their 'Iddah (prescribed period) is until they deliver (their burdens), and whosoever fears Allah and keeps his duty to Him, He will make his matter easy for him. "
So, this verse is saying it's ok to marry and divorce young girls who have not even reached puberty...really?