Calling priests "Father" is not inherently patriarchal if you also have female priests whom you call "Mother," which is the case in Episcopal Churches, particularly those Anglo-Catholic Episcopal churches who have embraced the ordination of women. Ordain women to the Roman Catholic priesthood and your problem with patriarchy is solved. No need to stop calling male priests "Father." Since pastors act as heads of a large "household," referring to them as "Father" or "Mother" is something I don't see as problematic. Not ordaining women, however, is.