I’m not suggesting you not attend a seder if your Jewish friend invites you; take that as a big compliment and be a good guest. Ask questions, learn what you can, and follow their lead. Passover is often observed with very close friends and family (or, as has happened to me on a few occasions, with distant acquaintances and strangers who have taken you in because you are far from home), and being invited is genuinely meant as an honor.
But please don’t host your own, especially if you are trying to emulate Jesus or find parallels between Jewish ritual and Messianic Christianity.
There is a trend among Christians — mostly but not exclusively Protestants — towards observing Jewish ritual in general and the seder in particular. There are books on Judaism aimed at Christians, and there is a whole movement, the “Hebrew Roots” movement, dedicated to understanding the Jewish influence on Christianity. They include both more respectful practitioners, who consult detailed books on accurate Jewish practice, as well as ones who adopt a pastiche of (often incorrect) Hebrew.