Said Musa, 45, has been held for eight months in a Kabul prison were he claims he has been tortured and sexually abused by inmates and guards.
Mr Musa, who lost his left leg in a landmine explosion in the 1990s, has worked for the Red Cross for 15 years and helps to treat fellow amputees.
Execution: Christians pray during a mass at a church in Kabul (file picture). Said Musa is facing execution unless he converts back to Islam
He was arrested in May last year as he attempted to seek asylum at the German embassy following a crackdown on Christians within Afghanistan.
He claims he was visited by a judge who told him he would be hanged within days unless he converted back to Islam.
But he remains defiant and said he would be willing to die for his faith.
He told the Sunday Times: 'My body is theirs to do what they want with.
'Only God can decide if my spirit goes to hell.'