Mrs. Päivi Räsänen is being legally supported by the Human Rights organisation ADF International.
The ruling, which is now final, is a significant a victory for freedom of religion and expression.
Her ongoing legal battle has become a symbol of the delicate balance between religious freedom and free speech in modern society.
She is being accused of "inciting hatred against LGBT people".
Päivi Räsänen, a committed Christian civil servant and grandmother, was put on trial for sharing her beliefs on social media
The court ruled that "it is not for the district court to interpret biblical concepts."
There were about 30 faithful praying inside.
Finland's public prosecutors are to appeal the judgement which threw out the charges against Räsänen.