I spoke earlier in a different blog of mine about the issue of religion and the registration of marriage for same sex couples by the clerks.

My point there was to point out that one may need to consider the rights such legal recognition, and you can replace the word "marriage" with any other word if it confuses you, gives before stating that it is against his/her religion. Because if there is a reasonably religiously acceptable use for it would it still be your responsibility if it used otherwise? 

After writing that I noticed even if we assume that there is no reasonably religiously acceptable use for that legal recognition from the point of registering the marriage for a same sex couple that may still not answer negatively that doing that as part of a job of issuing marriage licences generally would be in violation of religion. 

To explain that let me take the issue of alcohol in Islam as an example. To my best understanding about following Islam, despite how alcohol is forbidden I cannot sell it but I can sell grape to a person even if I know that he will be using it to make alcohol. 

This later possibility is related to the first argument here. 

But what if instead of those two possibilities somebody calls me to be a witness to a fact which I know being true regarding how an amount of alcohol belongs to him? Assuming no hardship in that, if I want to restrict myself with Islam should I accept or refuse?Which issue takes precedence in this case, that I should not help someone in drinking alcohol or that I should be just and a witness for the truth? 

If you answer that like me with the later option then one may follow that by this question which I recently noticed. Does that apply only to being a witness to the truth or this in itself is a special case of giving what you were trusted on to whom they belong? If so, even assuming there is no religiously valid use from the point of registering legal marriage for same sex couples for that recognition, still couldn't that action be considered giving back a right upon which you were trusted from your position as a general marriage registration clerk and therefore religiously valid?