Religion doesn't come up as a topic in the US either. That means very little about the religiosity of the person, it just means that people are polite because they know that religious opinions differ.

And a religious wedding or funeral just informs us about your relatives not about the UK.

Pretty common for people to have discussed with partners what for of funeral you would want - I know I have and it was clear that the last funeral I attended (of a colleague who died in a climbing accident) that he had very strong opinions about what any funeral would be like.

Same for weddings - I can't think of any wedding I have attended where it wasn't very clear that the style of the wedding was determined by the people getting married.

I think people don't generally talk about religion in the UK because it is pretty irrelevant to most of the population.