Well, Tolkien was a traditional catholic. And before Vatican II, at the mass of the holy friday, there was a prayer :
>"Oremus et pro perfidis Judaeis"
>Which means "Let's pray for the perfidious jews"
So, since he was a traditional catholic and that ALL the catholic tradition is antisemite, his philo-semitism must be nuanced.
Moreover, it's hard to paint yourself as an antisemite when you have Hitler as an interlocutor since :
>"Hitler dishonored antisemitism" Georges Bernanos, catholic writer
Numerous have been those forced to change their antisemistic positions because of Hitler's stupidity. Because Hitler was financed by jews against other jews racially impure (mixed with polish and others), and denouncing Hitler is denouncing jews.