UnforcedError
Settler
Bismarck has actually excellent traits (better then Rosie on noble I guess). Without a sample game it's a bit hard to give any advice, but I'd recommend you stick to the basics:I wasn't the stronged militarily, but I have a hard time having a bigger military without it consuming my entire budget when I play Germany.
1. stay away from the two early religions. Tech the necessary techs you will need to improve your resource tiles (prioritize food). Build a worker early (preferably first build).
2. Prioritize techs that will net you better units (especially BW and AH). Tech the Wheel to hook up second city. Settle bronze and / or horse asap. If you see neither, tech archery (if low on commerce and IW would take too long).
3. Expand. Chop / whip workers, settlers, units. Improve tiles quickly. Working unimproved tiles is a safe way to crash your economy. Rather whip a worker.
4. Beeline techs that give you a stronger economy. (Pottery, Writing, Alpha, Currency, Monarchy, if low on happy). Set up early trade routes with other civs (open borders and resource trades will also give you a diplo bonus with the AIs long term). Try to specialize at least one unit producing city (later you will need more).
The AI is programmed NOT to declare war before it can build at least two attack units (warriors and archery units don't count, so they need at least spears + axes).
With this tactics you should easily outexpand the AI on noble. Or just eliminiate them one by one.
I apologize if I managed to state the obvious here, however something in your posts made me feel you're either focusing too much on early religions or on early wonders. There's nothing wrong with wonderbuilding with Bismarck on noble, but believe me: you don't necessary need things like Stonehenge or the Great Wall. You need basic military, workers and settlers.