Marion - same-sex marriages are legal in Germany since last year.
The system here with all marrriages: legally important is the civil marriage in the Town Hall, afterwards you may have a ceremony in church.
With the handling of church ceremonies the churches are making differences: The Roman Catholics say strictly no, the protestants range from no to yes, including some levels of yes - but ... Here it depends on the parish and/or minister. Some do the real ceremony, some a slightly altered one.
Methinks, if a faithful couple asks for the Lord's blessing of their matrimony, it shouldn't be denied to them. This Christian attitude unfortunately is not agreed upon by all.

Wilfried