This is strange, because Leonardo was not a religious man. Although the National Gallery made a vivid case for him as a religious artist in its 2011 exhibition of his paintings, there is very little in his notebooks to suggest that Christianity was part of his everyday, personal life. Shopping lists are more prominent than prayers among his notes..."
Read more at "How Leonardo da Vinci's angels pointed the way to the future - The atheist innovator used religious commissions to test-drive his greatest invention – the flying machine"
http://www.theguardian.com/artanddesign/jonathanjonesblog/2012/dec/25/leonardo-da-vinci-angels-flying-machine
