ISIS militants sliced off the fingertips of 12-year-old boy in a bid to convert a group of Syrian Christians to Islam - but when they refused the terrorists executed all 12 people.

The unnamed boy's fingertips were hacked off because he was the son of a Syrian Christian ministry team leader who, along with the rest of the group, refused to renounce his faith.

The Gospel Herald reports one woman shouted out 'Jesus' moments before she and others were beheaded by the terror group.

The unnamed boy's fingertips were hacked off because he was the son of a Syrian Christian ministry team leader who, along with the rest of the group, refused to renounce his faith (file image of ISIS militants)

Christian Aid Mission, a humanitarian group which assists Christian workers in their native countries, reports that the horrific murders took place on August 28 in an unnamed village outside Aleppo, in Syria.

Relatives of those killed said on August 7 ISIS militants captured the Christian workers in their village .

The Mission reports on August 28 the militants asked the group if they had renounced Islam for Christianity, and when the Christians confirmed that they had, the rebels asked if they wanted to return to Islam.

When the Christians said they would not renounce their Christianity, and in front of a large crowd, the Islamic extremists cut off the fingertips of the 12-year-old boy and beat him, and told his father they would stop the torture if he returned to Islam.

When the team leader refused, relatives said, the ISIS militants also tortured and beat him and the two other ministry workers before all three men and the boy were crucified.

The group died beside signs the ISIS militants had put up identifying them as 'infidels.'

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Eight of the Syrian Christians were beheaded by the ISIS militants (file image) and four were crucified

On the same day eight other Christians from the village, including two women, were taken to another site and were asked the same questions before a crowd.

The two women, who were aged 29 and 33, were then reportedly raped by the extremists in front of the crowd before all eight were beheaded.

Christian Aid reports that as the two women and six men knelt before they were beheaded, they were all praying loudly.

After they were beheaded, their bodies were hung on crosses,

Patrick Sookhdeo, founder of Barnabas Fund, a charity which seeks to help Syrian Christians, told the Daily Express: 'It is like going back 1,000 years seeing the barbarity that Christians are having to live under - I think we are dealing with a group which makes Nazism pale in comparison and I think they have lost all respect for human life.

'Crucifying these people is sending a message and they are using forms of killing which they believe have been sanctioned by Sharia law.