yes it is yemen is partly a Muslim country
Most Arabians practice Sunni Islam, but there are significant minorities of Ibadi Muslims (in Oman -- where they are the majority) and Zaydi Shiite Muslims (in Yemen). Most of the Arabs in Saudi Arabia identify strongly with the Wahhabist Strain of Sunni Islam.
introduction of Islam in Yemen refered to the era of the Prophet of Islam Muhammad ibn Abd Allah peace be upon him when he sent Ali bin Abi Talib and Maaz bin Jabal to Yemen to call his people to Islam, was that the people of Yemen have responded to their invitation without hesitation or resistance.
islam is the official religion
Islam; Sunni or Zaydi.
99% of the population is Muslim
Many countries including Iran, Iraq, Saudi Arabia, Syria, Yemen, Kuwait, Emirates, Oman, Qatar, Jordan, Pakistan, Bangladesh, Malaysia, Indonesia, Lebanon, ...
Muslims practice Islam
Ali Abdullah Saleh is of the Zaydi Shia Islam faith.
Islam Islam
Muslims still practice Islam because they have strong faith in their religion.
They practice Islam religion.