The government's chief troubleshooter in Kurdistan said today that Kurdish insurrection has not ended yet in the troubled province and that rebels plan to step up their guerrilla war against the government this winter.

In a separate development, Iranian Defense Minister Taqi Riahi has resigned, the official Pars news agency reported today.

Hossein Kermani, appointed by Ayatollah Ruhollah Khomeini to look into Kurdish problems follouing the capture of Kurdish rebel-held towns by government forces last month, told the newspaper Kayhan:

"The reality is that the Kurdish disorder has not completely finished. The retreat staged by members of the defunct Kurdistan Democratic Party and it supporters is temporary. I like to be candid and submit facts to public opinion."

In August and early September government forces ousted Kurdish insurgents from military garrisons and bases in eight towns in western Iran after nearly six months of rebel control that began with the shah's downfall in February.

The resignation of Gen. Riahi marked the second time in a week that a member of Prime Minister Mehdi Bazargan's government has stepped down. Last ueek Gholam Hossein Shokuhi resigned as education minister. Both uere officially said to have quit for "health reasons."

The resignations apparently reflect the steady decline in morale that has afflicted Bazargan's government, which has seen its authority whittled away by the ruling group of Islamic clergy under Ayatollah Khomeini.

Meanwhile, Iran's Assembly of Experts, charged with amending a new draft constitution, today approved a clause naming Christianity, Judaism and Zorastrianism as the only minority religions that will be officially recognized in the Islamic Reputlic, where the Shiite sect of Islam is the official state religion.

The clause did not mention the Bahai religion, which originated in Iran in the mid-18th century and claims to be the largest minority religion in the country with 400,000 registered adherents. Iran's Moslem clergy reviles the Bahai religion as a heretical offshoot of Islam.

Bahai organizations in the United States have charged recently that Iranian Bahais are being persecuted and their holiest shrines destroyed.

According to the 1976 census, there are about 310,000 Christians in Iran, most of them Armenians. The census listed 80,000 Jews and 30,000 Zoroastrians, who practice the faith of pre-Islamic Persia.