She is being accused of "inciting hatred against LGBT people".
Christians demonstrated supporting Päivi Räsänen in front of the building of the Finnish Embassy.
Finland's public prosecutors are to appeal the judgement which threw out the charges against Räsänen.
Dr. Räsänen has served as Finland's Interior Minister from 2011 to 2015.
All three charges brought against Päivi Räsänen were dismissed but the prosecution may appeal within the next seven days.
He was forced to pay a fine of €4,800.
The former Finnish minister of defence is facing prosecution after citing the Bible in one of her Twitter posts.
Päivi Räsänen responded in court in the name of every Christian.
Six members of U.S. Congress have condemned the prosecution as “infringements on religious freedom.”