One comment that I've heard from a few different places is that church/Christianity is boring.
If it's the church that people find boring, in some cases, that's a fair enough comment. And that can usually just be solved by looking a round a bit at a few different churches, and you can usually find one that's spicing things up a bit, going a bit more contemporary.
But if people are saying that Christianity is boring, then we need to look into that a bit more. Usually, when people say that, it's because they see Christianity as giving up a lot of the stuff they see as fun - things like drinking, or sex, or even drugs if they're into that. It can be very easy to see Christianity as a long list of "Do-nots".
Two things I think I can say here. Firstly, it is not in the Ten Commandments "Do not drink". Jesus himself famously turned the water into wine, and that at a time when the guests had already had a fair bit to drink. It also does not say "Do not have sex". It says that it's something special that should be saved for your husband/wife. That's hard to do, yes, but all the more special because of it.
Also, I think sometimes people need to reassess what they think of as "fun". Generally, I'd call anything that brings me joy "fun". And I certainly don't have less of that as a Christian, I'd argue. God gives an amazing sense of joy, which can't be matched by other earthly things. The joy of God really is an absolutely amazing thing to experience. Though, admittedly, I can't really compare it to any of the three that I listed before, because I've barely experienced the first, and I haven't done either of the other two. But I'm pretty sure this is a heck of a lot better.