>> “Can they not worship the true God falsely?” <<
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Not according to the true God!
He says plainly in his Torah that one cannot add to, nor take away from it.
Man made worship is worship of man. Read Paul’s explanation in Hebrews 3 and 4. The reason that the gospel didn’t save those Israelites that died in the desert was their own lack of faith. There is only one gospel; the one preached to them was the same one preached by the apostles. That is what he said, and he had the benefit of a direct encounter with the arisen Yeshua on the Damascus road.
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I didn’t say that worshiping the true God falsely would save the worshiper.