I mean not to make any generalisations. I'm sure there are plenty of very computer-literate priests. It wouldn't surprise me to hear that some priests even contribute to development of open source projects etc. Also I know catholic clergymen have had a reputation of being true polymaths.
That said, I'm not generalising, and there are going to be some that aren't going to be too tech-savvy. The church-bloggers currently are the ones who have by their own initiative chosen to blog. The pope is encouraging all priests to use technology, and not all priests will, but it's very likely that some will go on and try it out, and over time someone will make a mistake. I believe this will be a very high profile mistake due to the nature of the medium.
I doubt this will convert anyone to atheism, but people in general are prone to making generalisations and it will hurt credibility. The difference between Toyota and the Catholic Church is that if you were to look at it as a business, the church sells faith. Credibility is pretty important to all business, but if your product is faith it's absolutely essential.
