Universities usually want a well-rounded student body, but they don’t expect each individual student to be entirely well-rounded. I think it’s overkill for you to send in supplements for science research, poetry and art. Your science and math grades do not support the idea of you being a serious contender as a science major, so I wouldn’t bother sending in a science supplement. Art as a hobby also does not sound like it would be your major, or has been an emphasis, so I wouldn’t send that in either. Serious art students would have won awards and had their work exhibited. As for the poetry, does that relate to your planned major at all?
I think you should focus how you present yourself in your application. Since your language skills and social justice and interfaith interests all go together, you could emphasize those things. They fit with some of your activities like mock trial, constitutional debate and model UN. You want to leave the admissions reps with a clear picture of you that they can remember, rather than a scattered and jumbled impression. That said, I think your grades and curriculum are going to be on the low side for Wesleyan. Be sure to apply to some places that you are sure you can get into and also sure you can afford.