Studies and demographic trends suggest that Islam is currently the fastest-growing major religion in the world.

As of today, Islam is considered one of the fastest-growing religions in the world. With over 1.8 billion followers worldwide, it is projected to continue growing in the coming years. Other religions, such as Christianity and Hinduism, also continue

Islam is reported to be the fastest-growing religion in the world, with its adherents increasing at a rate of about 1.9% per year, according to a 2015 Pew Research Center study. However, it's important to note that the growth rate of a religion can vary depending on factors such as birth rates, conversion rates, and mortality rates, and can change over time. Some forecasts predict that Islam will surpass Christianity as the world's largest religion by the middle of the 21st century.

Based on available data, Islam is often cited as the fastest growing major religion globally in terms of population percentage. This growth is primarily due to higher birth rates in Muslim-majority countries and younger demographic profiles rather than conversion rates.

Christianity still has the largest total number of adherents worldwide, but its growth rate is lower than Islam's in percentage terms.

Other fast-growing religious categories include: - Unaffiliated/non-religious groups in some regions - Certain evangelical and pentecostal Christian denominations in parts of Africa, Asia, and Latin America

It's worth noting that religious demographics are complex and growth patterns vary significantly by region and can change over time.