I have two questions:

This is off-topic but the finality of the beatific vision disturbs me. Seems like how I imagine Hell.

As regards answering the question, it may be an oversimplification, but I don’t think it’s unsafe to dichotomies and say that everyone either worships God (those in Christ) or themselves (children of Satan).

I know what you mean. It's kind of why I wanted to correct myself and say it may just be poetic on Catholicism's part. Which I could understand.

If it’s poetic it’s bad poetry.

As I understand it the soul (atman) is identified as identical to brahman (deity) so they worship not themselves in the created sense as such as that would be idolatry.

I don’t understand. If they worship their own soul, how is that not idolatry?

because they inadvertently worship deity, if you can accept others can worship God who are not trinitarians.

I wouldn't relate either concept of atman or brahman to anything Christian.

We do have concepts of the soul. But in Christianity (at least in Orthodoxy), man is three parts: soul, body, and spirit. On top of that, all are fallen, or in the case of the spirit, dead within man. Two fallen and one deadened part to man's nature will never bring you to God.

Only by the Spirit of God, through Christ, are they renewed.

“Deity” in general is not God; even less so if the self is seen as an instance of it. I think you are giving them too much credit. The only way to the Father is by the Son, and if you are a Christian then must be ok with many of the world religions leading straight to Hell.

Yes, and I second this Buddhists are self-worshippers

There's a difference between wanting to emulate God's sinlessness and wanting to emulate His power.