The sentence 'is considered wrong' is correct and usable in written English.
You can use it to indicate that something is generally thought of as incorrect or inappropriate. For example, "Cheating on tests is considered wrong by most people."
You wrote, "I had no idea that it is considered wrong in Christian circles".
But in "Straw attacked Clegg, who he thought was wrong" – "who" is correct, because it is "he" not "him" who is considered wrong.
"I had no idea that it is considered wrong in Christian circles to be engaged prior to being divorced," he wrote on FoxNews.com.
"I had no idea that it is considered wrong in Christian circles to be engaged prior to being divorced, even though in a state of separation and in divorce proceedings," Mr. D'Souza, 51, wrote on the Fox News Web site, using "Christian" in the evangelical sense, to mean born-again Protestant.
Some people have no preference but neither is considered wrong.
A small group of positions is considered wrong as well as religiously problematic.
A drink or two at a roadside café has never been considered wrong.
Even a defense psychiatrist testified that Mr. Taylor had an awareness that killing was considered wrong.
But the Watergate papers show conclusively that these decisions were taken on the grounds of expediency, and never really rejected because they were considered wrong.
More seriously, anti-Americanism can be contradictory: when the US failed to intervene in Bosnia, that was considered wrong, but when it did subsequently intervene in Kosovo, that was wrong, too.
Thus, according to these researchers, if practices such as polygamy or infanticide are considered right within a society, then they are right "for that society"; and if the same practices are considered wrong within a different society, then those practices are wrong for that society.
