“Christianity has not been tried and found wanting; it has been found difficult and not tried.” – Gilbert K. Chesterton
We fail at Christianity when we think it covers only attending group meetings to listen to speeches, memorization of information about the speeches, and obedience to rules that keeps us only going to group meetings and listening to speeches. If that is what Christianity is, then it is not difficult at all, for it requires nothing of you but your body sitting passively.
Christianity is about what you do with your life, and how you affect others with the love you display and the acts of mercy you do.
If your Christianity is not affecting those around you, and is not satisfying to you, perhaps the issue is not with Christianity but with your weak grasp of what it is all about. It is far more difficult to be a Christian, because it is more than just saying. It is doing.
It is the Kingdom of God among us. Not just talking about it.