The fact that so few considers the possibility that God is evil is proof of how gullible mankind really is.
If the almighty creator of the universe and everything we know and cherish had evil intentions with his creation, would it not make more sense to pose as a benevolent father figure rather than being honest? Just look at all prominent dictators throughout human history - how many of them openly stated that oppressing and deceiving the people was necessary to further their agenda? And how many of them did everything in their power to appear as good leaders who did everything they could to serve their people?
For all we know, the Bible could be a collection of fairy tales made by God to deceive the people into believing that God is good and homophobia, sexism and slavery should be accepted by the masses. And the only reason that the latter is now condemned is because people have deviated from God's intended, malevolent path.