"Do you think homosexuality is criminal?" is a meaningless question to ask. It does not matter what anyone thinks homosexuality is not a criminal activity: that is a matter of law, of fact.
Has Tim Farron ever made a secret of his christian views? If not, then was his attitude to homosexuality a matter raised during his party leadership campaign? Again, if not, then why not?
What is it about the Abrahamic religions that causes them to be so obsessed with matters of sex and sexuality? My guess is that private and personal behaviour can be used to generate guilt and shame .... and hence control.