Cultural and marital customs that boarder on abuse can be found in every culture.
What troubles me is how Islam actually allows for lying to advance the religion. In Christianity, this is condemned.
Romans 3:7-8 English Standard Version (ESV)
7 But if through my lie God's truth abounds to his glory, why am I still being condemned as a sinner? 8 And why not do evil that good may come?—as some people slanderously charge us with saying. Their condemnation is just.
With this in mind, Christianity is proven to be ethically more moral than Islam.