Islam, the completest religion?

Why is it that Muslims call their religion the completest Godly religion on th earth, but its practice these days is silly, brutal, and inhumane, according to common sense? Just look at execution by strangling, stoning, cutting off thieves’ hands, heritage for daughters [which is half the heritage for sons], blood money for women [which is half the blood money for men], temporary marriage, the value of women’s witness [which is half men’s witness], ….