Faith Deception?

Faith of ostriches

When Pope Francis warns against “administering a vaccine against faith”, what does he mean when he said the word 'faith'? Because, obviously, when he mentioned ‘vaccine against faith, definitely, he is referring to “faith” as a disease, because vaccines are only intended to prevent diseases.

But when he further warned against ‘administering’ the vaccine, then he logically meant that he is warning against the prevention of a disease.