With respect to homophobia, I'm hardly arguing that Christianity is the *only* source of that. But it's the predominant one in Africa right now. Evangelical Christians can be particularly vociferous in their condemnation of "sodomy", as they call it, and right now Evangelical Christianity is quite an important player in African politics.
Of course one can find the same through other religions, and even without religion playing a role, but it's not exactly uncontroversial that people going on about "the Bible says Adam and Eve not Adam and Steve", or that homosexuality is "against God's Will" (from the (Evangelical Christian) Ugandan President) are drawing their inspiration from Christianity, or a particularly extreme interpretation of it. Since in Africa homosexual activities are illegal in many countries (more than 30 of the 55), then yes, it does cause hardship.