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Here's a list of the few passages of the Montenegro Constitution of 2007 having to do with religion. It contains a separation of church and state guarantee and fairly detailed religious freedom provision.
Montenegro Constitution 2007
Establishment Clause
Article 14
Religious communities shall be separated from the state.
Religious Freedom
Article 14
Religious communities shall be equal and free in the exercise of religious rites and religious affairs.
Article 46
Everyone shall be guaranteed the right to freedom of thought, conscience and religion, as well as the right to change the religion or belief and the freedom to, individually or collectively with others, publicly or privately, express the religion or belief by prayer, preaches, customs or rites.
No one shall be obliged to declare own religious and other beliefs.
Freedom to express religious beliefs may be restricted only if so required in order to protect life and health of the people, public peace and order, as well as other rights guaranteed by the Constitution.