But what if we want to win Culturally and find out that before/without Astronomy we won't get access to enough religions (to pursue the Cathedral path, at least)?
(In my current Monarch game all the religions up to Taoism got founded on the other continent. Unfortunately I was not the one to discover Taoism (it was Mansa Musa, ouch, and by now the entire continent is Taoist, and he's got the shrine...). This is just to show a scenario where no own religions can hurt for reasons other than going for cultural win). When going for culture, I at least want to know if I'm isolated before deciding on how many religions of my own I'm going to found, so in this case, with the lake, I guess if playing cultural you absolutely should go for at least two early Rs. Just my two cents (I haven't decided yet what strategy I'm going to pursue, maybe not cultural, just did in GOTM12).
--Sigi
Well, yeah, if isolated on a small continent or an island, then early religions might be preferable (I did say "often not optimal"

). Still, I've found that even in these situations, you can make up for the lack of early religions by going for Confuscism, Christianity, and Taoism (preferably, Islam if not). Three religions is enough to achieve a solid early cultural win if you build the major religious buildings early.
There really are quite a few variables--map size, type, presence or lack of religious neighbors, randomness in religious spread, difficulty level etc.--so that no one path is optimal all the time, obviously. And our game here is quite ambiguous in this respect--middling difficulty, unpredictable fractal map--so that it's really hard to say before starting what will work best.
But if you can win without founding early religions--and have the luck or the strategic acumen to have one or two of them spread to you--then you are probably in a better position than if you found them yourself, since you can focus on other important early techs. Of course, if it turns out you are alone on a continent, for example, then you will likely regret not going for Hindu>Judaism>Christianity.
I haven't decided what victory condition to go for yet, myself. It's hard to decide because there are so many games out there for which we don't have results yet. If I knew that one of my recent games was a medal winner (I think I may have won the fastest diplo in WOTM2, for example, but I'm not sure), then I wouldn't go for that condition. I think I may wait a while before getting into this game to see if any results get posted for previous games.
By the way, does anyone know if the ratio for the number of temples needed to construct cathedrals and such increases on a large map the way it does from a small to a standard map? I very seldom play on larger than standard maps and haven't encountered this situation. This would be good information to know for anyone considering a cultural win.