One of the purposes of RCIA is to introduce to you what Catholics believe. If, in the course of the classes, you find that you can accept and affirm Catholicism, you can enter the Church. If not, there is no obligation to become Catholic and you can postpone your entrance until you can in good conscience affirm the Catholic faith. So, yes, you can indeed take the RCIA classes.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.