"Christian" ... Since when has it become fashionable to define oneself by religion? I mean especially in professional circles like software development. I don't expect to see "Jew" or "Moozlim" (sic) or "Amoral Atheist" used to define people. Lots of respect for his work but I it does turn me off because of what it might imply As far as personal biases.
So no, it's not unusual at all for a Christian to highlight the fact. From the point of view of a Christian in an increasingly secular world it probably feels more necessary than ever.
P.S. I am a Christian by birth but not vocation.