In 2021, nearly ** percent of respondents aged 16 and over in Poland belonged to the Church or religious association, with the most significant percentage (** percent) belonging to the Catholic Church. Denominations in Poland In 2021, Christianity was the dominant religion in Poland, establishing 125 registered denominations. The Christian faith had over 33 million adherents. Also, Poland had 207 churches and religious associations in the same year, with Protestant denominations accounting for the most significant percentage. A forecast of the religious composition of Poland in 2010 shows changes in the number of affiliates by 2050. While there were over 36 million Christians in 2010, their number was expected to decrease to almost 29 million over the next 40 years. The study predicted an *****-fold increase in the number of Muslims. An unbound community is expected to double. Public opinion on religion and religiosity Although most Poles are Catholics, their religiosity is decreasing year by year. The COVID-19 pandemic has significantly affected the scale of participation in Sunday Mass and the sacramental life of Polish Catholics. The proportion of people attending Sunday Mass dropped to **** percent in 2021. Due to the pandemic restrictions, the number of people receiving Holy Communion also decreased.Most Poles agreed with the presence of crosses in public buildings in 2021. In contrast, only ** percent of respondents favored priests instructing people on how to vote in elections. Almost every second respondent in Poland had a negative opinion about Muslims in 2019.