The two basic points are 1) every religion has a valid political dimension 2) every religion has suffered from being harnessed to political interests which have no basis in religion.
Buddhism has a valid political dimension. The Buddha gives clear advice to rulers in the Kutadanta and Cakkavatti-Sihanada Suttas. Islam and Judaism have more obvious political dimensions because both Mohammed and Moses were law-givers. The Qur’an and Torah both provide the bases for legal systems to govern polities of various shapes and sizes.