"Britain is the only European economy that is growing at the moment," - I think you make my point. We have carved out a VERY nice little niche in Europe, best of all worlds, and the economic results are due to that, not Brexit (which has not happened yet, in case you were unaware).
"we have the highest fertility rate in the EU" - that may be true in Bermondsey, I do not want one of your Miiiiiii mates serving me coffee in Caffe Nero thanks very much
"The big Eurozone crisis is around the corner" - on that we agree. It will affect us whether we are in or out, in fact we'll still be in anyway.
"our friends in the USA, Australia, India and China" - now you really are ****ing joking. Maybe the first two at a stretch but all of them will love negotiating with our pathetic little Liam Fox with all the cards stacked on their side