I also think un-promoted Christians are fully entitled to use any trick in the book to account for why they are un-promoted. There has been decades of of this behaviour from other minority groups, so why not give Christians an opportunity to join in the fun? After all they are as entitled as anybody else to blame someone else for their un-promotedness.
The article in The Telegraph leads by stating the survey subjects believe their lack of promotion is due to their faith. Given that they also believe a magick man in the sky gonna solve all their other problems in this live or the next this is not a big stretch, but makes the premise of this article flawed, fatally.
Full disclosure - I am currently an unemployed agnostic - it's probably my own fault :-)