While 46% of practicing Catholics voted for François Fillon in the first round of elections, 37% of Muslims voted for Jean-Luc Mélenchon. These findings are according to an Ifop poll for the newspaper Pèlerin, published on April 24.
Among Muslims, Emmanual Macron trailed Mélenchon with 24%, followed by Benoît Hamon with 17% and François Fillon with 10%.
Additional results of polls estimating Catholic and Protestant participation can be found here.
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Sources
http://www.lefigaro.fr/elections/presidentielles/2017/04/24/35003-20170424LIVWWW00008-en-direct-election-presidentielle-2017-emmanuel-macron-et-marine-le-pen-au-second-tour-tous-les-resultats-du-premier-tour.php
