There have been reports of an increase in Polish Catholics applying for apostasy certificates to leave the church.
I believe that some Islamic countries' laws are different for Muslims and non-Muslims (e.g. alcohol consumption), and that apostasy can be taken very seriously and may even regarded as a crime. However I assumed that, in the USA and most western European countries, people just walk away from a particular Christian church when they lose or change their faith. The idea that paperwork may be required for Christian denominations is new to me.
I haven't been able to discover if the possession of an apostasy certificate confers any advantages to someone in Poland. Is it merely a formal statement notifying the church that you are not to be counted as a member, or are there wider political/legal/civil rights implications?