1. A young faith
Nowadays, most religions recognise other faiths and encourage tolerance. But there is one that has done so since its very birth in mid-19th Century Persia: the Bahá'í faith.
Bahá'ís accept all the great world religions as having true and valid origins. Their central idea is that people of all beliefs and cultures should unite together for the common benefit of humanity.
This message had radical implications.
2. One universal faith
Peter Owen Jones visits the Bahá'ís' most holy site in Haifa, Israel and finds a religion that's inclusive and tolerant of all faiths.
To understand how these ideas came about, we have to take a step back and meet the father of the movement: a young merchant who would go on to adopt the name the Báb.
3. Challenging the religious establishment
Born on 20 October 1819, Siyyid Ali-Muhammad Shírází became known as the Báb, a word which means 'gate' in Arabic. His message was the gateway to a new world.
He announced that he had received a message from God. The message was that a great prophet - the Promised One - was coming to establish a world of peace and justice.
He quickly built up a substantial group of followers who became known as Bábis.
The Báb's message soon provoked a backlash from the Shia Muslim establishment, who regarded it as heresy.
He was eventually executed by firing squad in Tabriz, in modern day Iran, on 9 July 1850.
But the Bábi faith didn't just die out with the death of its founder. The Báb had paved the way for the coming of the faith’s greatest figure.
5. Peace, equality and education
While Bahá'u'lláh's central message was that humanity should unite into one single, peaceful society, there was much more to his philosophy.
He believed men and women should be fully equal, and that extremes of poverty and wealth should be eliminated. Every human being would have the right to education and it would be each individual's responsibility to use that education in the search for truth.
Bahá'ís believe God is perfect, but his power is too great to be understood by the human mind.
There's no clergy or priesthood in the Bahá'í faith. The Universal House of Justice, a body elected every five years by Bahá’í representatives from all over the world, directs the faith from its seat in Haifa.
Bahá’ís worship through prayer and meditation, and by participating in devotional gatherings. Active service in their communities is considered an important way to worship God.
But there's a darker side to the Bahá’í story.
6. Continued persecution
In Iran, the Bahá'í faith continues to be regarded as heretical by the religious establishment.
Since the Islamic Revolution in 1979, Bahá'ís haven't been allowed to openly practise their religion and some of their most sacred sites have been destroyed.
They have been denied access to higher education and employment and many Bahá'ís have been arrested and imprisoned without trial. There are allegations of religiously motivated killings.
According to the Bahá'í International Community's United Nations Office, Bahá'ís are the largest religious minority in Iran today. Their estimated number is 300,000.
7. Who's challenged the religious establishment?
The 19th Century saw the rise of many new religious movements and revivals in the Christian Church in Europe and America.