Anyone reporting on any religion that they know nothing about is certain to make errors (It's hard to find anyone reporting about LDS who don't get something wrong!).
Perhaps one of our Catholic posters can clarify, but I did some additional
looking into it to confirm what I thought: Christening seems to refer to the entire Baptism/Initiation ceremony which does involve a ritual renouncing of Satan, the baptism itself (immersion or sprinkling with water), an
anointing with oil, and a clothing with a garment representing "putting on Christ".
Personally, I think it's quite cool, seeing how 'christ' means 'anointed', and thus, according to this tradition, one literally becomes an 'anointed one' / a
Christian, as they begin the Christian walk.
All really have nothing to do with the Original Post, but just some additional info for the heck of it