Are the Freemasons a spiritual group?

It depends upon what you mean by "spiritual". Freemasonry normally requires its members to have a belief in a Supreme Being (i.e. God), makes frequent references to revealed scripture, teaches reverence and other virtues expected of religious people, and starts and ends its meetings with prayers. If this constitutes being a spiritual group, then yes, Freemasons are one. But the discussion of the pros and cons of any religion or religious sect, and the use of religious language which might offend someone of another religion is strictly forbidden. Freemasonry does not endorse any particular view of the nature of God, any plan of salvation, any doctrines about what is or isn't scripture or any matter of a dogmatic nature. The prayers are non-sectarian, and constitute the only mandated behaviour which might be akin to worship. If these facts means that Freemasonry is not a spiritual group, then it isn't.