Whoever remains in him doesn't sin. Whoever sins hasn't seen him, neither knows him.
If we were to translate 1 John 1:8 and 1 John 5:16, where the present tense also occurs, "do not continually have sin" and "continually sinning a sin" respectively, these verses would contradict 1 John 3:6. It would involve no self-deception to say that we do not continually have sin (1 John 1:8) since whoever is born of God does not continually sin (1 John 3:6). Furthermore if one born of God does not continually sin (1 John 3:1), how could a Christian see his brother Christian continually sinning (1 John 5:16)? Suppose we translated the present tense in John 14:6 the same way: "No one continually comes to the Father except through Me." This would imply that occasionally someone might come to God in another way. No orthodox translator would offer that as an acceptable rendering of John 14:6, and it is not acceptable in 1 John 3:6 either.