What is the appeal of Christianity?
1. Life is a war, and...
2. Life is a quest.
(So far, the Christian life is as exciting as anything can be - as exciting as a gripping novel, movie or TV show - with all the classic plot elements. Life, my life and yours, are playing for the highest stakes; like, but more than, the most epic-catastrophe eco-disaster thriller - but with immortal souls at stake instead of just temporary bodies.)
3. Life is a destiny.
(All the above is about you, specifically. You are part of a big war and universal quest, with a family, comrades, a nation... But also within that plot you have your own unique destiny, that nobody ever had before, or will ever have again - and which only you can accomplish.)
4. Life has an extra dimension.
(Add to the above an undiscovered realm of spirit, and expansion of everyday reality, an extra depth behind everything. There is always more than meets the eye. Magic is real, supervillains are real, superpowers are real. Everything is in some way alive, in some way conscious, and part of creation. There is a secret garden, a fairy kingdom - accessible from everywhere...)
5. Life matters: it is real, serious and/because permanent.
(This is so because followers of Jesus will each live forever in an indestructible body; there is potential for our experiences in mortal life to have everlasting effects for eternity. Christians can 'take it with them' after death. And the persistence is not into something like a museum of dessicated artefacts; but is a living, growing, creating, developing kind of enduring.)
Note: And if your Christianity is Not as above, then you are probably missing the point. Because all that stuff, above, is not just available to all Christians, but is how Christians ought to be - ought to see themselves and their world...