It seems to be the fashion in the Catholic Blogosphere to spot errors on the EWTN Questions and Answers. Most surprising of all is the blunder of Fr. Robert J Levis who claims that in Latin I doubt whether the name "Jesus" can be declined. It remains "Jesus".
Now, I've seen it argued that in Latin 'Jesus'/'Iesus' is either wholly irregular or a very irregular 4th Declension noun. Whichever one decides, it should be obvious to anyone with a smattering of Church Latin that 'Jesus' is declinable
Per Dominum nostrum Iesum Christum
Ad Iesum, per Mariam...