Indonesia's Orang Rimba: Forced to renounce their faith
In a wooden hut on stilts, a group of children dressed in white sit on the floor. They sing "I will protect Islam till I die" and shout "There is no god but Allah", in unison.
Three months ago, the 58 families that make up the Celitai tribe of Orang Rimba converted to Islam. They were picked up and bussed into Jambi, the nearest city, and given clothes and prayer mats.
The Islamic Defenders Front - a vigilante group whose leader is facing charges of inciting religious violence - helped facilitate the conversion.
Ustad Reyhan, from the Islamic missionary group Hidayatullah, has stayed to make sure the new faith is practised.
"For now we are focusing on the children. It's easier to convert them - their mind isn't filled with other things. With the older ones it's harder," he says.
"Before Islam they just believed in spirits, gods and goddesses, not the supreme god Allah.
"When someone died, they didn't even bury the dead, they just would leave the body in the forest. Now their life has meaning and direction.
Outsiders are the "people of the light", because they live in open areas and are often in the sun, unlike the people of the jungle.
The surrounding majority Muslim population calls the Orang Rimba "Kubu".
"It means that they are very dirty, they are garbage, you can't even look because it is so disgusting," explains anthropologist Butet Manurung, who has lived with the Orang Rimba for many years.
"It also means primitive, stupid, bad smelling - basically pre-human. People say their evolution is not complete."
It's thought there are about 3,000 Orang Rimba living in central Sumatra.
"If you came before, you would have seen our forest. It was pristine, with huge trees," says Yusuf
Now there are seemly endless ghostly white burnt-out sticks in one direction, and palm oil trees in neat rows in the other.
The absence of any natural sounds is eerie.
"It's all gone. It happened just in the last few years. The palm plantations came in, and then the forest started to burn," adds Yusuf, referring to 2015's devastating fires, which burnt more than 21,000 sq km of forest and peat land.
The streams in the plantation are polluted with pesticide and his family is getting stomach problems drinking from it.
"There is no forest for them to hunt in, the water they fished in and drank from is polluted, and so is the air," says social affairs minister Khofifah Parawansa, matter-of-factly. "So we are giving them houses, villages to live in."
The government - working with plantation companies - has built a number of housing estates for the Orang Rimba.
Last year, President Joko Widodo announced more new housing and some land for them, following a meeting with tribal leaders - the first organised by an Indonesian head of state.
Minister Khofifah says faith is part of this process.
"On the identity card, they have to state what religion they have. There are those that have become Muslims, some who have become Christians. So now they are getting to know God."
But many of the housing estates have failed and are effectively ghost towns.
Without work or a way to feed their family, many Orang Rimba who lived in them briefly went back to the traces of jungle that are left.
"What we want is for them to stop taking away our forest. We don't want houses like the outsiders," says Ngantap, one of the elders of an Orang Rimba tribe.
"I am at peace and happy in the forest, I am a person of the jungle."
Ngantap wears the traditional loincloth of the Rimba people, with a bag of cigarettes hanging from the side.
Unmarried women traditionally wear simple sarongs covering the breasts. Once married, the sarong is tied around the waist leaving breasts open for feeding babies. Many now wear clothes from the outside.
But Ngantap insists they are holding on to their faith.