The tradition of the Church of the East (Chaldean and Assyrian) is to have a curtain, functioning similarly to an iconostasis as being the uniting separation between the nave and the sanctuary. In Chaldean and ACoE parishes, men and women sit together, this is worldwide, so I think you might have gone to one of the exceptions to the rule. Lack of iconography was attributed towards the belief in no graven images, however it has just been maintained as tradition now, and Assyrians personally have some form of icons at home.
It is also interesting that you had such a strange experience with that deacon. The Assyrian Church in the middle east has very good ties with the Eastern Orthodox and Eastern Catholics. Even in my experience, Assyrians are very open and close with their Catholic and Orthodox counterparts. Assyrian Church of the East Christology is currently much more Chalcedonian now than it has ever been in its history. One remaining issue is that the title “Mother of God” is still misunderstood as her as a source of God’s existence, so they prefer to say “Mother of Christ our God.” It is a residual contradiction, as she is recognized as the Birthgiver of God, and not the source.
Don’t hesitate to ask any more questions about the ACoE and Chaldean Church