Back in settler times, Portugal was the only country from which settlers didn't have to prove their Catholic ancestry when converting to New Christians. So the M's and J's were able to use that to pose as New Christians while staying loyal to their ancestry. And it was in Portugal where they created their base of operations for the TA trade...
3rd temple is gonna look different. It’s got to be appropriate for the times and large enough to serve the entire world. There will be probably be a virtual component. Would be cool if we had art and designs imagining it rather than copying what the 2nd looked like.