Feng Zhili, the chairman of Zhejiang's ethnic and religious affairs committee, said Christianity's growth had been "too excessive and too haphazard".
China is an officially atheist state that offers only formal recognition to five religions: Buddhism, Roman Catholicism, Islam, Protestantism and Taoism.
Religious beliefs are officially discouraged, particularly among the Communist Party's more than 85 million members. However, support is offered to many officially sanctioned churches and some within the party view religion as a useful ally in maintaining social stability.
Xi Jinping, the president, has been quoted as saying that China is "losing its moral compass" and thinks "traditional" faiths such as Buddhism, Confucianism and Taoism could "help fill a void that has allowed corruption to flourish", Reuters reported last year, citing sources close to the leadership.
Last November, Wang Zuoan, China's most senior religious affairs official, suggested faith should be encouraged in order to promote "the religious principles of reconciliation, benevolence, tolerance and moderation".
But such practices should be carried out "under the leadership of the party and the socialist system", Mr Wang, the head of the State Administration of Religious Affairs, wrote in the People's Daily.