The answer
Yes, Copts (Oriental Orthodox Church) and the Eastern Orthodox Church believe in Original Sin and not in the Immaculate Conception. Only the Catholic Church believes in the Immaculate Conception.Please read the following articles on these topics:
Original Sin - http://www.suscopts.org/messages/lectures/soterlecture1.pdf
Immaculate Conception - http://www.suscopts.org/messages/lectures/marilecture1.pdf
Answered by His Eminence Metropolitan Youssef (opens in a new tab)