Is mere membership to a terrorist organization, without committing any acts of terrorism, punishable?

Yes
It depents
No idea
No

It depends on the laws and regulations of the specific country or jurisdiction. In some countries, mere membership to a terrorist organization may be considered a criminal offense and punishable by law, regardless of whether an individual has committed any acts of terrorism. In other jurisdictions, it may not be punishable unless an individual actively participates in or supports terrorist activities. Ultimately, it is important to consult the laws of the relevant country to determine the specific consequences for mere membership to a terrorist organization.