The exact way it was practiced long ago during Muhammad [S.A.W]'s time
Saudi Arabia, Indonesia, and Pakistan are three countries where Islam is widely practiced. Islam is the dominant religion in these countries with a significant majority of the population adhering to its teachings and beliefs.
The majority of people in Afghanistan practice Sunni Islam, with the Hanafi school of jurisprudence being the most common. There is also a minority population of Shia Muslims, particularly among the Hazara community, who follow the Twelver branch of Shia Islam. Sufism, a mystical branch of Islam, is also practiced by some Afghans.
If the question asks about which country has the largest Muslim population (i.e. people that are practicing Islam), then it is Indonesia (~ 203 Million Muslims).
Middle East countries (Saudi Arabia, Iran, Iraq. Qatar, Kuwait, ...), India subcontinent (India, Pakistan, Bangladesh, Afghanistan, ...), South East Asia (Indonesia, Malaysia, the Philippines, ...), and North Africa
Christianity is practiced most today in the Americas, particularly in the United States and Brazil, as well as in Europe, with countries like Russia, Germany, and Italy having significant Christian populations. Additionally, countries in Africa such as Nigeria and the Philippines in Asia also have large Christian populations.
Seriously? Of course not
Islam religion is practiced today the same way it was practiced in time of prophet Muhammad (PBUH). Quran and Sunnah (prophet Muhammad sayings and practices) are valid anywhere any time until the Day of Resurrection. Refer to related question below on Islam teachings.
It is everywhere except the Vatican city and the strict Islam nation.
Islam is being practiced in every country. The countries with the ten largest Muslim populations are Pakistan, India, Indonesia, Bangladesh, Turkey, Iran, Egypt, Nigeria, Algeria, and Morocco.
Um, where is WHAT practiced today?
Yes. Although Judaism is the predominant religion, many religions are practiced in Israel, including Islam.
Yes, it is practiced all over the world.
Islam.
Islam
please, see the related question below which is " In which part of the world is Islamic religion mainly practiced today ?"
Allover the world and ranging from small minorities in some places to 100% majorities in other places.
Muslims are those who practice Islam. Islam is practiced everywhere in the world, but predominantly in South Asia, Indonesia, and Middle East and North Africa.