The 2005 film 'Into great silence' about the Carthusian Monastery of Grand Chartreuse, is well worth ,if you get the chance, as is the 2009 film 'No greater love' about the lives of Discalced Carmelite nuns in Notting Hill. I notice that another film about religion 'Of Gods and Men' has just won a prize at the Cannes Film Festival. It is about the murder of seven Cistercian monks in Algeria.
So there do seem to be some film which project a more positive view.
On 'Christianity', Dermot is, of course, an historian and nothing to do with the Oxford divinity school. He is an ex-Anglican whose view on Christianity is partly formed by being the son of a vicar, and partly by his being gay.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)