I don't believe in luck.
I live at number 13 in proud defiance of superstition! But I so sometimes wonder: do I stand in defiance of some actual cause-effect truths? Is this a risky proposition?
I was taught probability theory at university where we learned that if you throw a coin a hundred times and get 99 Heads, the likelihood of a Tail in the last throw is still 50-50 despite our intuition to the contrary. I remember writing a random number generator program for my father who was looking to develop a roulette system and didn't have the heart to tell him that any patterns he spotted were most likely due to the imperfections of the algorithm being used. There are physical laws at work here. A "lucky" person who throws a coin can no more influence the outcome than I can.
Yet despite much science and materialism, many of us believe deep down that there is more out there, that our universe is affected by external forces, that there should be a fair outcome, that the hundredth throw should yield a Tail. I believe this is because we are wired to seek beyond the confines of this universe for the God who made us, who placed in our hearts these non-materialist notions.
Christians should not believe in luck. We have access to God through prayer to affect outcomes of the situations we are in. The results of our prayers are not always what we expect because there are complicating factors such as our growth and God's purposes, but we trust that He knows what he's doing.
So with God in control, Christianity ought to be un-lucky, and I reckon I'm pretty safe at number 13, but might just change the house name to something alluring like Oak Glade when it comes to trying to sell. ;-)