Of course, we'd have to get the several thousand dollars (just for the US) to become a legit church.
Churches with budgets under 5K just incorporate locally, and that's cheap.
even 501(c)3 status, which churches do not need, is under $600.
501(c)3 is for any nonprofits, even nonreligious. It's good, in that fsm could collect donations that would be tax deductible for the donors. And, as long as bobby's pirate ship was going to arguably be used for the public good somehow, the money could be directed towards that if you'd like. Or an educational waterslide theme park across the street from the creationism museum. It could fund that, too.
I worked on the board of a nonprofit that had 501c status. I don't remember paying $600 for it. There are a bunch of rules that would be pretty easy for us to comply with, involving the minimum number of board meetings per year, etc. It turns out pretty good, because once you have nonprofit status, people are much more willing to make donations to the cause. For example, with tax deductible status, we could get a noodle manufacturer to donate a million noodles, since they can then write them off as legit charity. I don't know if anyone needs a tax break big enough to give us a pirate ship or a theme park, but hey, some richie rich must need the deduction! But our nonprofit was able to do fundraisers and get the venues to donate the space and other businesses to donate various raffle prizes, etc. Even a local brewer donated a couple of kegs to the cause for one fundraiser!