According to the 1928 Fundamental Statute of the Kingdom of Albania: "The Albanian State has no official religion. All religions and creeds are respected, and freedom of worship and religious observances is guaranteed."

The current Albanian constitution guarantees religious freedom in Article 10. The Constitution of the Republic of Albania was passed on November 28th, 1998.

References:

1928 Fundamental Statute of the Kingdom of Albania: https://www.hoelseth.com/royalty/albania/albconst19281201.html

1998 Albania Constitution: https://www.constituteproject.org/constitution/Albania_2012