Mandy Marshall, from Restored, was speaking after the government announced it will double the maximum sentences for stalking offences from five to ten years in prison.
The maximum sentence is also doubling for stalking offences which are religiously or racially aggravated, from seven to 14 years in jail.
Marshall said the increase in sentences was a "good thing", adding that Christians need to be aware stalking happens in churches too and victims must be adequately supported when it does.
Campaigners and politicians have been urging the government to introduce tougher punishments for the crime for years.
Last month ministers announced plans for Stalking Protection Orders which mean suspects could be ordered to stay away from their targets or have their internet use restricted, even if they haven't been arrested or charged yet.
Around 1 in 5 women and 1 in 10 men are stalked
194 people were convicted of stalking in 2015
They received an average of 14 months in prison
Speaking on Premier's News Hour, Mandy Marshall said: "At Restored we think this is a good thing.
"The depression and anxiety that results from being stalked, the sleep disturbances, the paranoia, agoraphobia, even post-traumatic stress disorder in some cases, affects victims lives on a day to day basis.
"Churches need to be aware of stalking and particularly where the stalker is there and using the church as an open space, there needs to be a level of awareness... and to hold perpetrators to account and to challenge them appropriately and safely."
Justice Minister Sam Gyimah said: "Stalkers torment their victims and can make everyday life almost unbearable. We are doubling the maximum sentences available to the courts so these awful crimes can be properly punished.
"We are also working across the criminal justice system to ensure mental health issues associated with these crimes are properly addressed."
Listen to Premier's Alex Williams speaking to Mandy Marshall on the News Hour: