Protestants are less than 1 % of the population of Libya

Libya

Libya is an African country in the Maghreb region of North Africa bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad and Niger to the south, and Algeria and Tunisia to the west....

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There are peaceful relations between Christians and Muslims.
It is prohibited to proselytize Muslims.
A non-Muslim man must convert to Islam if he wants to marry a Muslim woman.
Religious literature is restricted.
Hundreds of African migrant Protestants attend services in Tripoli

Tripoli

Tripoli is the capital and largest city in Libya. It is also known as Western Tripoli , to distinguish it from Tripoli, Lebanon. It is affectionately called The Mermaid of the Mediterranean , describing its turquoise waters and its whitewashed buildings. Tripoli is a Greek name that means "Three...

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Christian communities consist almost exclusively of sub-Saharan migrants.

Non-Muslim women who marries a Muslim man are not required to convert to Islam.

The Government limited the number of places of worship allowed for each Christian denomination to one per city.
There is persecution of Christians by authorities.
There is no Bible in Libyan Arabic

Libyan Arabic

Libyan Arabic is a collective term for the closely related varieties of Arabic spoken in Libya. It can be divided into two major dialect areas; the eastern centred in Benghazi and Bayda, and the western centred in Tripoli and Misrata...

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Secret police look out for persons, who evangelize.
There are also Pentecostal worship places in places like Misrata and Tripoli.

Denominations

• Baptist Church in Tripoli
• Coptic Evangelical Church
• Seveth-day Adventist Church
• Union Church of Tripoli
• Tripoli Bible Church

Source of the list: The World Christian Encyclopedia, Second edition, Volume 1, p. 457

Pentecostal worship in Libya

There are Protestant worship groups in Libya in places like Tripoli and Misrata. These churches are primarily worship groups who gather together every Friday. These groups are led by Pentecostal pastors. Though these worship places are not officially approved by the Government of Libya still these groups assemble togther without any problems from the government.
The churches mentioned below are known places of Pentecostal worship.

• Indian Prayer Fellowship, Tripoli
• Global Faith Fellowship, Misrata