You just don't get it, or, more accurately, won't get it. You have made your point about theism, sometime back in 1970, or something, and to waffle on about: "Theism is irrational, fatuous, juvenile and predicated on all the laziness of mind and slackness and sloppiness of thought that I detest, and it needs to be countered everywhere, all the time" is just old hat, not to mention totally over the top. Just why does it need to be countered, and I mean the theism we of Christianity? Radical Islam, maybe, but I don't notice much comment in that department.
Radical Islam is a minor problem in British society and culture. It exists, but far out on the margins, way out in the hole-and-corner lunatic fringes of small numbers of disaffected young men (usually) in deprived urban areas. This isn't to say that nothing should be done about it; it's to say that the priorities need to be kept straight. It's the established state Christian church which sought - for example - to prevent same-sex couples from having a civil (i.e. secular, i.e. absolutely none of their damned business) marriage. It's the same church that always chips in trying to prevent people from having the easeful, dignified and painless death they seek. And so forth.
And in any case, in attacking theism one is attacking Islamic theism as much as Christian or Jewish theism. Anti-theism is precisely that - anti-theism.
That is an ignorant and disgraceful comment. There have been over a hundred terrorist atrocities in the UK since the 70's, including, of course, 7/7 in London, and the butchering of Lee Rigby; plus unknown numbers of thwarted plots or conspiracies. You lamely quote such things same-sex marriage, yet that is changing anyway, and is hardly a like-threatening topic. People here can live their lives free of any connection with the Church: it need not impinge on anybody's life. You utterly over-state your case, and dismiss Islamic Radicalism which is a threat to our life and society. Your position is untenable.
You say Islam has no effect on the culture here. This is a quote from the Spectator:
"The introduction of a madrassa curriculum at a secular state school in Birmingham and talk of Christian pupils at risk of ‘cultural isolation’ seem to have come as a revelation to non-Muslim Britain. They should not have. Islam in Britain is dominated by a very specific, and rather illiberal, version of the faith — one that, if anything, seems to be becoming more conservative over time.
As the Muslim population became more established, one might have assumed that a westernised form of Islam would have come to dominate Britain’s mosques. According to a database of British Islam, however, only two out of 1,700 mosques in Britain follow modernist interpretations of the Koran. It’s not the same elsewhere in the West. In a 2011 survey of Islam in the United States, 56 per cent of mosques described themselves as following an interpretation of Islam adapted to modern circumstances. This has not happened in Britain."
There is an increasing, often worrying, influence of Islam on the culture here, in schools, through Sharia Law, and in a decided failure to integrate.