I'm forever astonished that people are surprised when followers of a certain religion (or denomination within that religion) actually, you know, follow it!
Some parts of the Bible teach that homosexuality is a sin (yes, yes, open to interpretation, Jesus never mentioned it specifically etc) and the Bible teaches that you can repent from your sins and to hate the sin and love the sinner. So it is abundantly obvious that some - albeit not all - Christians will believe that homosexual acts are a sin. Even the liberal Church of England believes the acts themselves are a sin.
So these people believe that homosexual acts are a sin and wish to help those who choose to go to their seminar, to repent.
Most of us here may not agree with them - that's fine, that's our right. And importantly it's our right to say so. But there's 7 billion of us on this planet and yet it would appear that some people are perpetually surprised when it becomes apparent that 7 billion people don't all agree on something.
If you don't like this conference then speak out, protest, write letters, buy a ticket and challenge them directly etc etc etc. You have every right to do all these things. But why are you surprised that they think this way?
And by the way, Christianity is no different to Islam and Judaism on this one.
And to the person who called the right to free speech, "bollocks", are you quite quite mad?