Would Finding Alien Life Change Religious Philosophies?

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13. But there is a difference.

There is nothing but anecdotal evidence for leprechauns, etc. There are, however, things that exist on the Earth which no scientist has ever been able to explain. Give a good explanation for these, and the hypothesis of ET visitation grows weaker. No one's done that yet.

Sagan was probably the most outspoken opponent of Immanuel Velikovsky's hypothesis of Venus. In his TV series Cosmos (Episode 4), he lays out in detail his arguments against him. But at the end of that segment, he says that the problem with Velikovsky is not that he was wrong. The problem was that scientists dismissed him out of hand, without even looking at the evidence.

I look at evidence. And I'm not afraid to question the current paradigm.

As you say, YMMV.