I have family members that intermarried. They celebrate the 25th. We do get together. We have a bagel breakfast in the morning, we go to eat kosher Chinese food at night, we will go to a movie, etc. I asked my rav, and he said that it is actually a mitzvah for me to do this so that they can still feel as if the religious part of the family loves them and cares for them.To their credit, while the kids aren’t actually Jews al pi halacha, they love when we come. They come to shabbos meals by us and we have sedarim (we go to a communal seder together on the 2nd night), they usually come on CHM sukkos to have a meal in the sukkah together, we have chanukah together one night. Some of the kids, if there’s an interest, may get involved in Judaism and convert later on. We were told by our rav that this is praiseworthy.
In the case of Jesus, he was wicked because he was a false messiah, and he did horrible things. He cursed people, disrespected his mother, and called a Samaritan woman a dog.