Another method that has sometimes been used to determine the magnitude of religions in Russia is to count the number of their officially registered organisations. Such criterion, however, leads to inaccurate assumptions for various reasons. There is not the same arithmetic relationship between religions' number of local organisations and the number of their believers, as different religions have different organisational structures. Furthermore, different religions have different attitudes towards the registration of their organisations, and secular authorities register some without difficulties while hinder the registration of others. For instance, the Russian Orthodox Church is eager to register its communities when they are still at the embryonal stage, and many of them are actually inactive; the Old Believers traditionally do not consider registration as essential, and some branches reject it in principle; and Protestant churches have the largest number of unregistered congregations, probably around ten thousand, most of them extremely small groups, and while many denominations discourage registration, they often also face a negative disposition from secular authorities.