Question Number 1518:
Can I hold to the teachings of Perennialism (cf. Frithjof Schuon, Ananda Coomaraswamy, Rene Guenon), claiming that all major religious traditions are salvific and be an Orthodox Christian simultaneously?
No. An Orthodox Christian, to be an Orthodox Christian, is required to believe that:
1. Jesus Christ is the only way to the Father. (cf. John 14:6) One can only find salvation in and through Him, or as St Peter teaches, "Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved." (Acts 4:12) Salvation is by union with Christ. No other religion provides union with Christ and hence, no other religion is salvific apart from Christ Jesus.
2. Jesus Christ is present to us in His Body, the Church. One is united with Christ by participation in the sacramental and prayerful life of the Church which is a visible organism and community.
For those who are born and raised in other religions and who do not know Christ Jesus, salvation, if possible, would still have to be the gift of God and ultimately by being united to Christ Jesus.
Hope this helps.