In this case, no, he does not appear to be a Muslim or convert and was likely doing it for "Ultra-Nationalist" reasons; but I don't want to jump the gun, one can research for themselves.
Frenchman 'planned attacks during Euro 2016' - Ukraine's SBU
A Frenchman detained last month with a large cache of arms was planning mass attacks during the Euro 2016 football tournament, which starts on Friday, Ukrainian officials say.
The man, identified by French media as Gregoire Moutaux, 25, was arrested on the Ukrainian border with Poland.
Intelligence chief Vasyl Hrytsak said the man had planned 15 attacks and was driven by ultra-nationalist views.
He had amassed guns, detonators and 125kg of TNT, Mr Hrytsak said.
Mr Hrytsak listed bridges, motorways, a mosque and a synagogue among the suspect's potential targets. He was being prosecuted for arms smuggling and terrorism, he said.
More At: http://www.bbc.com/news/world-europe-36460569