The historian of religion Mattias Gardell noted that there is "no unanimously accepted theology" within the Heathen movement. Several early Heathens like Guido von List found the polytheistic nature of pre-Christian religion embarrassing, and argued that in reality it had been monotheistic. Since the 1970s, such negative attitudes towards polytheism have changed. Today Heathenry is usually characterised as being polytheistic, exhibiting a theological structure which includes a pantheon of gods and goddesses, with adherents offering their allegiance and worship to some or all of them. Most practitioners are polytheistic realists, referring to themselves as "hard" or "true polytheists" and believing in the literal existence of the deities as individual entities. Others express a psychological interpretation of the divinities, viewing them for instance as symbols, Jungian archetypes or racial archetypes, with some who adopt this position deeming themselves to be atheists.