How much would a 1901 german bible be worth?

Answer 1

It really depends on its condition. If it's complete, with no separation on the binding then potentially it's somewhat valuable. Additionally, if it has your ancestors birth/death data in it, that gives the book a "story", and adds to the value.
Your best bet is to find a rare book store in your area that specializes in conservation/restoration and ask them for an appraisal. Usually those are free, and you will at least know what to ensure your Bible for.