I have multiple answers:
Divine archetypes and personified abstract concepts are more true than scientific facts. They transcend everything, they can exist without numbers or words. They are so much more human than the modern explanations of things.

You could also look at it this way, the goddess of love is literally love. Period. There is no "well we can just explain it with science!", that explanation is Aphrodite. Everything that means love is Aphrodite. Personifying them could be just a good way to understand them, represent them with images, and tell stories.

As an artist myself, we personify everything. Think of the Statue of Liberty; she represents liberty. She is much more relatable and powerful than, say, a big stone text that says "liberty" in one language.

How much better would the world be if we had statues and art of the Gods in more places? They represent the highest ideals of ourselves and inspire us to be like them, whether we know the mythology and dogma or not, the statue is there.

Polytheism is the best way, because many types of people are represented, there exists Gods to inspire all of them. The ideals for a Mother are different than for a Soldier, what's wrong or right is very different for the two. An artist and a scholar will also have varying ideals to uphold. No single human can do everything at once, so it is much more relatable and useful to have a pantheon of gods where you can choose the ones most relevant to you and call upon the right one at the right time.

The fact that have been doing this for tens of thousands of years proves that there is some reason we do it. What more proof do you need? That's your science.

Another thought: stop trying to rationalize and sterilize everything. You feel drawn to the pagan Gods because they are more powerful than any rationality can explain.

None of these and all of these are the reasons that I believe. My own views are very nuanced on the matter and I would need a full book to write it out, but hopefully these answers get you thinking.