Well I'm not supposed to tell you, but as this is a solution to a direct question...
First of all how many fingers are we talking about? Do you mean finger joint as in a box, or finger joint as in a window frame, for example. My bandsaw jig will do both, but I'm the first to admit that it is not the most sensible option for boxes. Possible yes, accurate, yes, efficient, no. Jig for the router table is a much better option. I have a video on YouTube showing one that works well.
If you mean a finger joint as in a multiple bridle joint as used in window frame manufacture, then that is a different matter. You are not going to get the depth of cut necessary on a router table. And as you are probably planning a 3-and-2 finger joint for such a situation, a bandsaw is a perfectly sensible choice in the home workshop. Accurate and reasonably quick, too.
You'll have to follow the link in my signature to find out more, or drop me an email.
Cheers
Steve