The Catholic Church very clearly states that there is NO reincarnation. In some aspects, Scientology appears not unlike Buddhism, Jainism and the Sankhya tradition in Hinduism, but the premise on which its soteriology rests is that of practical and systematic therapeutic techniques. Confession and understanding one's self bring about salvation. Believing in Jesus Christ and in the One who sent him for our salvation is necessary for obtaining that salvation. First, a bit about soteriology.
Soteriology means a theological doctrine of salvation.
Scientology teaches that understanding of one's own self is necessary for salvation. The Catholic Church teaches that there is NO other way to salvation. Scientology teaches that it's techniques ARE a way to salvation. Note that carefully.