Spreading the word? (liberally)

It's a strange tension: the prospect of this "Jesus-movement" changing the world, of it being something truly radical and revolutionary for the sake of the oppressed and marginalised, can be genuinely exciting ... but I am hopeless when it comes to speaking to people who do not know much about it. In fact, my liberal sensibilities are such that I am very reticent, tending to be very wary of what people will make of it - after all, passion is a bit embarrassing, isn't it?! - and there are so many problems with the Church at large, that it is difficult to invite people to be a part of it ... and on the one hand, I don't lose any sleep about this, because I focus on working with the people already committed to the church, and kind of expect them to invite others! So how, if at all, should I set about becoming more able to say "this story is worth it", "this movement really can make a difference - trust me"? And how especially should I do this without being heard as saying "this movement is the best", because I know only too well that other agencies are making invaluable contributions, and other faiths must always be part of the conversations?