Africans and Christmas and Christianity

Have a happy Christmas/Frostfell/Hanukkah/Kwanzaa/Saturnalia/Winter Solstice/Winter Veil/Yuletide.

Something I have been thinking. Some African-Americans honor their heritage by observing Kwanzaa, but if they really wanted to honor their heritage wouldn't they leave the religion that was forced upon them by their oppressors (Christianity or Muslim depending on who took over their particular region) and instead go with one of the many good ancient religions of Africa?