Since 2016, Slovak laws makes it impossible for Islam to become a state-recognized religion. Slovakia has adopted measures making it difficult for Islam to become one of the country’s officially recognized religions, making it the European country with the toughest laws against Islam in all of Europe.

In 2016, two-thirds of deputies, including opposition ones, voted in favor of laws submitted by the governmental Slovak National Party (SNS) that required religious groups in the country to have 50,000 followers to run their schools, open religious establishments or qualify for government subsidies. The law previously required only 20,000 signatures.

According to official sources, Islam, which was primarily targeted by the law, has a maximum of 5,000 followers in Slovakia.

https://ussanews.com/News1/2020/02/22/slovakia-effectively-bans-islam-from-country-forbids-mosques/