Not really, it's the premise that is the same. The idea that a thing could be ignored, regardless of how factual, nor how many contradictions it my cause.
Yeah pretty much. But there is one HUGE difference. Alien contact would most probably result in a massive influx in new technologies and further advancements of our own. It could contribute hugely in further demolishing the relevance of these ancient religions just as the scienitific revolution has done already.
Dinosaurs are a big deal, but they really don't change the way we live. Alien contact and technology very well could.