The problem with Islam is the same problem with Christianity. Hardly anyone actually follows it.

"Men are the maintainers of women because Allah has made some of them to excel others and because they spend out of their property; the good women are therefore obedient, guarding the unseen as Allah has guarded; and (as to) those on whose part you fear desertion, admonish them, and leave them alone in the sleeping-places and beat them; then if they obey you, do not seek a way against them; surely Allah is High, Great."

Also (forbidden are) women already married, except those (captives and slaves) whom your right hands possess. Thus has Allah ordained for you. All others are lawful, provided you seek (them in marriage) with Mahr (bridal money given by the husband to his wife at the time of marriage) from your property, desiring chastity, not committing illegal sexual intercourse, so with those of whom you have enjoyed sexual relations, give them their Mahr as prescribed; but if after a Mahr is prescribed, you agree mutually (to give more), there is no sin on you. Surely, Allah is Ever All-Knowing, All-Wise.

Your wives are a tilth for you, so go to your tilth (have sexual relations with your wives in any manner as long as it is in the vagina and not in the anus), when or how you will, and send (good deeds, or ask Allah to bestow upon you pious offspring) before you for your ownselves. And fear Allah, and know that you are to meet Him (in the Hereafter), and give good tidings to the believers (O Muhammad).

So modern Muslims that want the Quran to be more inclusive of women and promote equality mistranslate the Quran and misinterpret it.

Unlike Christianity, Islam is pretty clear. Your wives are your property who are to be submissive and obedient to you. You can beat them into submission. You can do whatever you want with your sex slaves, which you're allowed to have also along with your wife who you can have many of not just one.