>There would be very possibly some money and influence involved from countries that do not share Swiss people values.

But then why not address that by banning foreign funding of construction of religious buildings? If Swiss Muslims want to build a minaret on their mosque I personally don't see the harm. But it's clear that others disagree.

I do not know what is really going on here but I can think of something that is similar. Imagine that Swiss communists want to raise a 10m high statue of Stalin. From one point of view it is just a statue but from another point of view it is a huge symbol that in many ways advocates against what Swiss people value.