The marriage certificate, 1858, is the earliest evidence you have that John COLLINS ever existed.
All the information on this certificate is useful.
Can you please list all the information on the document....everything please....occupations, ages, dates, addresses, church married in....and names........all of them, including witnesses.
If some headings have a blank, or a dash, or "not known"....please indicate that.
The marriage document you have...is it a typed document, or image of a handwritten record.