If you made a profession of faith, and you bore no good fruit, we have Biblical justification to believe that you are not saved(James 2:18). Your testimony would show man that you know not God, or rather, are known by Him(Gal 4:9)
The problem with James is that Jesus says you can't tell the wheat from the tares:
Matthew 13:26 But when the blade was sprung up, and brought forth fruit, then appeared the tares also.
Matthew 13:27 So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?
Matthew 13:28 He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
Matthew 13:29 But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.
Matthew 13:30 Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
The reason being is that James is talking about showing his faith before men:
[TABLE="class: table_bible"]
[TR]
[TD="class: td_bible_verse_heading"]
Jas 2:18[/TD]
[TD][/TD]
[TD="class: td_bible_text"]Yea, a man may say, Thou hast faith, and I have works:
shew me thy faith without thy works, and I will shew thee my faith by my works.[/TD]
[/TR]
[/TABLE]
And you can't always see what God is doing because you will damage the wheat.
You can't see the wind so you can't tell who is born again or not and since 1 John 1:9 He says that if we confess our sins, He is faithful and just to forgive us our sins then you wouldn't tell by a person sinning whether they were forgiving or not because they were showing you their sins even though God forgave them their sins. When we see people with sins, we think they are not saved and is that "just" because if Jesus forgave the person for confessing their sins then God is just (according to 1 John 1:9) and we can't call God into question.
John 3:8 The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.
(C) Chuckt 2016