Vienna's religious landscape is changing - with a decline in the number of Catholics and Christians and an increase in the number of Muslims due to immigration and secularization.

A study by the Vienna-based WIREL project showed that in 30 years time only one third of the capital will be Catholic and the proportion of Muslims will almost double to 21 percent.

Researchers estimate that Vienna is currently around 41 percent Catholic, four percent Protestant, nine percent Orthodox (mainly Serbian), 12 percent Muslim and 0.5 percent Jewish. Three percent are other religions and 30 percent are atheist or agnostic.

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