Deum, non hominem venerare

That's the correct writing of the sentence you wrote.
Still, it would mean "Worship God, not man".
"Time" would be the most suitable verb, just as Tina8 suggested, in answering a question previously asked by you.
http://www.proz.com/kudoz/1391545

Thus, if you want to keep this same structure of the sentence, it should be:

"Deum, non hominem time"

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Note added at 2 hrs (2006-06-07 21:05:57 GMT)
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If you want to accept the Late Latin form of the verb, as suggested by Mathias, you should have "venera".
"venere" is absolutely wrong in this context, as it is either the ablative of "Venus, Veneris" = Venus or the shortened form for "venerunt" (from venio) = they came and "veneris" (from venor) = you may/should hunt.

And I reckon that if you want to have it tatooed, probably for ever, you should have it written in a proper and correct Latin.
:-)

HIH


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Note added at 15 hrs (2006-06-08 09:15:29 GMT)
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Starting from Joseph's good suggestion and seeing that you had written "Dues" instead of the correct "Deum", I am starting to think you probably meant to write "verere" instead of "venere".
Thus, summarizing, you have:

"Deum, non hominem venerare/venera" (Worship God and not man)
"Deum, non hominem time" (Fear God and not man)
"Deum, non hominem verere" (Fear and respect God and not man)

Plenty to choose from for your tatoo.
Enjoy!
:-)