When a Christian refuses to make a wedding cake for a wedding they consider blasphemous, they are subject to threats by liberals, boycotts and get sued. And per LBGT legal protections, the individual may be sued personally as well as professionally and either shuts down or loses everything (or both).
When an atheist refuses to serve a Christian, the courts back that up as "political speech". The Colorado Civil Rights Commission actually ruled on this in one week - a homosexual business refusing to serve Christians is protected political speech and OK, but Christians refusing is religious and thus unacceptable.
Christian theology is routinely mocked and undermined by major publications around Easter and Christmas.
Mock Islam nowhere nearly as bad, and your life is threatened. And when Pamela Gellar's "Everyone draw mohammed" art contest in Garland Texas was attacked by armed Muslims in 2015, SHE was blamed for provoking it. So blaspheming Christians is routine and acceptable, but criticize Islam and the violence by Muslims is considered your fault.