Ms McAlpine has also written to the Lighthouse Church in Dumfries to ask them to reconsider their invitation.
The politicians were commenting after it emerged the church is set to host notorious homophobic preacher Angus Buchan after a scheduled appearance in the Borders was cancelled due to local outcry.
Buchan was prevented from preaching in Galashiels due to the extremely controversial views he espouses on LGBT people, women and children. He preaches that homosexuality is a “disease” that can be “cured” by prayer and that men can “remedy” their masculinity. He also suggests that women should subject themselves to their husbands and support corporal punishment of their children.
Responding to the scheduled appearance, equality activists in Dumfries have organised a peaceful protest condemning Buchan’s bigotry.
Commenting, Joan McAlpine MSP said: “The Lighthouse Church should not be endorsing these prejudiced messages by giving a platform to Mr Buchan. There comes a point where hate speech turns into violence. We know that LGBT+ people are subject to physical attack ranging from incidents in the street to horrific terrorists acts such as we saw recently in Orlando. That starts with hate speech. I would seriously question the decision made by the Lighthouse Church to host Mr Buchan, it seems very un-Christian.
“We have to take a zero tolerance approach to homophobia and bigotry.”
Emma Harper MSP said: “We need to come together to challenge this kind of hate speech and instead promote equality and respect through education.”