Tens of thousands of activists are angry because China has preselected the candidates they can choose from in upcoming elections.
Hong Kong's leader, CY Leung, is urging protestors to stop "immediately".
Andrew Gardener, senior pastor at The Vine Church in Hong Kong, told Premier: "There's been a lot of turmoil around the city and there's been a lot of people that are confused about what's happening or are caught up in the process and need a quiet place to come to, and so what we felt strongly to do is just open our doors of our building.
"It's a very simple thing but it's a very important thing."
He's also calling for prayer for all those involved in the process: "Pray for continued peacemaking. So far, the protestors have been nothing but peaceful and have been unarmed...We're praying as a church that peace will continue, so if you could join us that would be great."
The protests are to reach their peak tonight and tomorrow as Hong Kong has two national holidays on Wednesday and Thursday.
The UK Foreign Office has called for the Hong Kong government to protect the rights of protestors.