If you are sure the suspension you have uses the bearing retainer style of spindle and it's not there then, no it is not safe to drive it as the plate is what holds the bearing in place. However they used 2 different front spindles on the Neons, one uses the plate with bolts while the other uses an internal snap ring in the bearing bore. Yours would have come with the retainer plate version but they can be swapped around.
Why do you think yours is missing? Could you perhaps take a picture of the missing area just to be sure we are talking about the same part. The bearing retainer I'm referring to is in the attached image.
Image (Click to make bigger)
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Wednesday, June 16th, 2021 AT 2:48 PM