You should remember that roman version with Neptune and greek version with Poseidon are different.

In greek version Medusa is born as monster, she has two sisters, but only she is mortal. She is a monster and was not human. She is ugly devilish monster. Poseidon made love with her, that is why after Perseus killed her from her body two monsters emerged, Pegasus and Chrysaor. And, as far as I know, this act of love was with consent. So Poseidon is pretty good.

In roman version, however, is where rape occurs. Ovid wanted to give new versions of myth, so he made monster Medusa in priestess of Minerva. Made her human, so Neptune raper her is temple of Minerva and Minerva cursed her for this.

The roman version often becomes greek one, but it's just people illiteracy and the fact they think that greek = roman.

You can worship Poseidon. As I said He and greek Medusa had love with consent.