Why should any religion preach for sexual equality?

Or, to put it another way, why look to religion for advice for integrating the sexes. I don't care whether or not Islam or Christianity or Judaism or any other religion preaches equal rights for the sexes. It doesn't bother me, but it irks me when people try to prove their religion is better than all the others by peddling lies and mistruths.

Women and men are not 100% equal in every way in Islam, or any other mainstream religion that I can think of. That's fine. But stop pretending that this is the case.