In many of the most important areas, yes.
While Orthodoxy differs from Catholicism in structure and emphasis, it ultimately shares many of the same foundational theological problems.
1. Orthodoxy Rejects Scripture Alone as Final Authority.
Orthodoxy teaches that authority comes from both Scripture and “Holy Tradition.”
While they affirm the inspiration of the Bible, they also teach that Scripture must be interpreted through:
- Church fathers
- Ecumenical councils
- Church liturgy
- Historical tradition
In practice, this means the church becomes the final interpreter of truth.
That directly conflicts with the sufficiency and clarity of Scripture.
The Bible teaches that Scripture is sufficient to equip the believer for every good work:
“All scripture is given by inspiration of God… that the man of God may be perfect, throughly furnished unto all good works.” — 2 Timothy 3:16–17
Church history is valuable, but it is not infallible. Scripture alone is God-breathed.
2. Orthodoxy Holds to a Faulty View of Salvation.
This is the biggest issue.
Orthodoxy does not teach justification by grace alone through faith alone in Christ alone.
Instead, salvation is viewed as a lifelong process of participation in God through sacraments, repentance, fasting, obedience, and spiritual transformation (“theosis”).
While Orthodoxy rightly emphasizes transformation and sanctification, it confuses sanctification with justification.
The Bible teaches that sinners are declared righteous before God entirely because of Christ’s righteousness credited to them by faith.
Orthodoxy instead blends faith and works into the basis of acceptance before God.
That is not a small disagreement. That is the heart of the Gospel.
3. Orthodoxy Elevates Tradition Beyond Scripture.
Orthodox theology relies heavily on church tradition and historical continuity.
But one of the major problems is inconsistency.
Even within Orthodoxy, there are disagreements over how binding various councils, traditions, and practices actually are.
For example, some historical Orthodox councils strongly defended the veneration of icons—even pronouncing curses on those who rejected them—while modern practice is often softer and less consistent.
This creates an unstable authority structure.
If tradition is infallible, which traditions count? Which councils are binding? Which church fathers are definitive?
Ultimately, Orthodoxy ends up selectively appealing to history in ways that can become inconsistent and subjective.
4. Orthodoxy Contains Serious Doctrinal Problems.
Orthodoxy also teaches doctrines and practices that go beyond Scripture, including:
- Prayers connected to Mary and the saints
- Sacramental salvation
- Veneration of icons
- Mystical teachings about the afterlife
- A priestly mediation system
Some Orthodox traditions even teach concepts similar to “toll houses,” where souls are examined after death regarding their sins and spiritual condition before entering God’s presence.
These ideas simply are not grounded in clear biblical teaching.