Define "worship," and which Christian doctrines these non-Christians don't accept.
The virgin birth, the resurrection, Jesus being the "only way the truth and the life and the only way to the Father is by him", Jesus being the only "Begotten" son of God.
I can worship next to anybody. What they're doing does not necessarily invalidate what I'm doing.
Virgin birth? Not a critical aspect of faith.
If they don't accept the resurrection, or don't accept Jesus, how does that affect what I'm doing?
Playing with words like "begotten" is pointless.