A German court has ruled that German authorities cannot deport a Christian asylum seeker back to Iran where he may face execution for converting from Islam to Christianity.

A director who shares the ideas of Iran's hardline president has produced what he says is the first film giving an Islamic view of Jesus Christ, in a bid to show the "common ground" between Muslims and Christians.

Concerns about the health and safety of the son of martyred Iranian pastor Hossein Soodmand are swirling around Ramtin Soodmand as he awaits trial for "promoting anti-government propaganda."