If God made Pluto to be a planet why did scientists downgrade Pluto?

Let's consider that Pluto has life, we can go much further, let's consider that on Pluto has liquid water and and fish and whales and all kinds of living things. So from the assumption that life could really exist on Pluto why did scientists downgrade that "planet"? Okay, we can't take an... show more Let's consider that Pluto has life, we can go much further, let's consider that on Pluto has liquid water and and fish and whales and all kinds of living things. So from the assumption that life could really exist on Pluto why did scientists downgrade that "planet"? Okay, we can't take an assumption as true, but 99 per cent of science are meant to be assumptions, so if we can't think about it
using little scientific data to trying to understand a matter that we don't master, then we should stop doing science because to assume that Pluto isn't a Planet because of its size isn't science, it's prejudice.
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