The Charity Commission has accepted that druids' worship of natural spirits could be seen as religious activity.

BBC: Druidry to be classed as religion by Charity Commission

Previous research had suggested that this part of the brain (which regulates emotion) is an important centre of religious activity.

ECONOMIST: The science of religion

Before drawing conclusions about the significance of our figurine the religious context of the society must also be explored: can we identify special cult places, ritual paraphernalia, depictions of religious activity?

FORBES: Lois P. Frankel On Citibank, Manning Up & Being Nice

But the guidelines emphasise the separation of church and state, reiterating that schools "may not endorse or favour religious activity or doctrine, coerce participation in religious activity or seek to impose their religious beliefs on impressionable children".

BBC: Clinton sets limits on religion in schools

Rather as in the economic sphere competing private companies tend to produce wealth and activity, whereas monopoly firms have the opposite effect, so in the religious sphere competing sects generate a ferment of activity and increased levels of belief, whereas state churches produce indifference.

ECONOMIST: Therapy of the masses

Since there is no religious edict, or fatwa, banning laughing and whistling, the group has to acknowledge that the activity is perfectly legal.

ECONOMIST: Stop that laughing, please