Jeff Green was speaking after the party released its manifesto on Monday, with a pledge on banking reform, led by the Bank of England, to reduce the national debt.
The party leader claimed the introduction of same-sex marriage in England, Wales and Northern Ireland had also left some Christian voters he had encountered feeling abandoned by the political system.
Mr Green highlighted Premier's ComRes survey, which found only 51% of respondents, believed the leaders of the other main political parties were committed to protecting religious freedom.
"David Cameron brings in same-sex marriage, and then you've got people losing their jobs because they state they still believe in traditional marriage. Politics are [sic] interfering with people's faith within the United Kingdom to such a degree you now have to question whether we actually still have free speech," said Jeff Green on Premier's News Hour.
"Christians are now struggling to find people to vote for who truly appreciate their point of view. So we have to give them a standard to rally to, we have to give them a position and a way to re-engage with the political process, which is what the Christian Party exists for," he added.
The manifesto also focuses on issues such as the sanctity of life, traditional marriage and British constitutional law.
Leader of the Christian Party, Jeff Green speaking to Premier's Des Busteed:
