This academic study offers a critical look at the role of religion in contemporary European politics, specifically focusing on the intersection of the 'Russian World' ideology and Christian identity. Through a collection of scholarly contributions, the book analyses how religious language and tradition are being mobilised to influence social and political landscapes across the continent. It invites readers to examine the shifting boundaries of faith, nationalism, and societal values, providing a comprehensive overview of the religious tensions that define our times. Essential for researchers and those interested in the relationship between theology and public life, this work unpacks the complex 'many faces' of Christianism, moving beyond simplistic narratives to offer a nuanced understanding of faith in the public square today.