most religions have probably gained from some kind of atrocity, maybe. but since the days of the crusades etc, science has evolved very very far, and shown us for example the earth isn't the centre of the universe, evolution, the big bang etc. we're slowly moving away from religion, and society has improved a lot.
but when i see all the terrorism and holy wars (jihad) carried out by muslims, in an attempt to spread islam and eventually impose islamic law, i see it as a step back of at least a thousand years in society. women's freedoms would be restricted, you'd get stoned to death for adultery, just 2 examples of outdated unjust laws. we know more about the world now, and that's why christianity/judaism/[any other religion] isn't spread by force nowadays.
people should be able to believe in whatever religion they want to, and there should never be any religious or racial hatred. a religious text promoting the deaths of non-believers is IMO racist. hence why in this context, criticising islam and the koran cannot be considered racism.
as for the recent bombings, they might've been motivated by the iraqi war, but maybe not. if the UK and USA governments were so bothered about spreading democracy and peace throughout the world, why are they not doing anything about mugabe, sudan, or china?? why only the middle east?? despite claims that the USA is a freely democratic society, why does there remain so much controversy surrounding the last 2 presidential elections?? why don't we have proportional representation, a fairer democracy? the USA/UK war may have been in the name of democracy and WMDs, but in private were probably about oil. and this doesn't help us fight against terrorism, only increase the risk of it.
we must clamp down on terrorism hard and fast. instead of spending money on an unjust war, we must use our resources and troops on securing our borders, and make it much more difficult to get terrorists and/or weapons in&out of the country. police should monitor where incitement is most likely to occur, even if its at a mosque. any preacher of racial hatred and their supporters must be arrested and deported straight away - if they want an islamic country, they can go back to one. you can't just allow them to continue under 'human rights, freedom of speech' crap. by tackling terrorism in this way, at the bud, those who hate and despise the UK would no longer be a threat.
sorry for the long post. please read
http://answering-islam.org/Authors/Wood/two_faces.htm and read the writer's excellent arguments.