I suspect in this case your answer is attracting extra down votes precisely because it was marked as accepted by the OP. An answer that is deemed wrong might normally attract a couple of down votes if it has no up votes, but because it has been marked accepted, some people may be wanting to counteract the authority such acceptance gives to it. You also see the same thing with highly upvoted but contentious answers: lots of answers have net scores of -2 or -3, whether that's +0 and -3 or +30 and -33.
Now is there any legitimacy for the community to declare an answer "wrong" even though the question asker accepted it? Actually the way the Stack Exchange system is set up, that's always a possibility. Good answers are seen to be good by the community as a whole endorsing them through their votes. In this specific case, the OP doesn't appear to be very knowledgeable, asking not just about the relationship between the 10 commandments and the 2 commandments, but also what are the 2 commandments. A large number of people in the community disagree with you both about what the 2 commandments are, and about the relationship between the 10 and the 2.