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This category seems valid within Wikipedia guidelines to me.
This is an umbrella category for general opposition against islam in Europe, NOT (only) anti-islam organisations, but general opposition: opposers (people/politicians) from Europe, opposers (groups) in Europe, movements and ideologies, islam-opposing events and demonstrations in Europe, discussion platforms, interviews. Indeed, this can be further sub-categorized, but all subjects above show a strong connection between them. Therefore I contest the deletion, because this broad spectrum should be viewable as one entity.
The term 'anti-islam' is a superlative; it implies agression and violent extremism against islam. Opposition is milder. By this reason the two categories cannot be merged. IF any merging should occur between the subjects 'anti-islam', 'opposition of' and 'criticism of', the subject 'opposition of' should be chosed because implies the broadest spectrum.