The false doctrine you follow claims that we keep ourselves pure by keeping our sin ledger perfectly balanced with confessions. You claim that anyone who fails to keep their sin ledger perfectly balanced is impure.
In addition we see that the false doctrine you follow also keeps Christians under the law (in spite of the fact that we're not under the law, Rom 8:2, Rom 10:45, Gal 3:25, Gal 5:18, 1Tim 1:9). Thus, being under the law, Satan, the accuser (Rev 12:9,10), can continue to accuse us of sin.
But, what does scripture say regarding your insistence that 1Tim 5:22 refers to purity by remaining under the law that we're not under anyway, and keeping our sin ledger perfectly balanced with confessions?
How did Christians purify themselves?
1John 3:2,3
Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
And every man that hath this hope in him purifieth himself, even as he is pure.
This hope that purifies Christians is that now we are sons of God, because we believe on Jesus.
1Pet 1:18-22
Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;
19 But with the precious blood of Christ, as of a lamb without blemish and without spot:
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
21Who by him do believe in God, that raised him up from the dead, and gave him glory; that your faith andhope might be in God.
22 Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
What "truth" purified us?
It was believing on Jesus, who redeemed us with his precious blood.
Tit 2:14
Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
Again we see that it's when we believe on Jesus that we are purified and redeemed.
Clearly there are no deeds of the law mentioned in these scriptures on how Christians became pure.
Clearly, the way to become impure is to be in unbelief.
How does one become an unbeliever?
Gal 5:4
Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.
Thus we see that the false doctrine you follow (of righteousness by works of the law) is actually how one becomes impure. That is how one becomes a partaker of another's "sin", 1Tim 5:22.
How does one make themselves a sinner?
Gal 2:18
For if I build again the things which I destroyed (righteousness by works of the law), I make myself a transgressor/Sinner