In Christianity, the individual is not accountable for his/her own actions, but instead their sins are transferred to Christ. In theory, a Christian who is saved could commit many sins, but in the end it's all forgiven by the blood of Jesus (as). Christianity has no laws to abide by; there are no set prayers, no dietary restrictions, no economic laws, etc. So there is nothing to really judge a Christian on except by their belief in Jesus (as) as their savior.
Well I will say to this, that you don't really understand what Christianity is about. First let's go over some ground rules as to what a Christian really is. Here's a look at a few scriptures:
'Jesus answered them, Verily, verily, I say unto you,
Whomsoever committeth sin is the servant of sin.
And the servant abideth not in the house for ever: but the Son abideth ever.
If the Son therefore shall make you free, ye shall be free indeed.' John 8: 34-36. This is talking about freedom from sin, no matter what your background is.
'Therefore
if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.' II Corinthians 5: 17. This is not just referencing your mindset, but your lifestyle, you completely throwing off the sinful man and putting on the righteousness of God. It also references the new birth.
'What shall we say then? Shall we contine in sin, that grace may abound?
God forbid.
How shall we, that are dead to sin, live any longer therein?' Romans 6: 1-2.
'All unrighteousness is sin: and there is a sin not unto death.
We know that whosoever is born of God sinneth not, but he that is begotten of God keepeth himself, and that wicked one toucheth him not.
And we know that we are of God, and the whole world lieth in wickedness.' 1 John 5: 17-20.
The Bible says that Jesus died to take away the sins of the world, and that's exactly what it means. It doesn't just mean that he died in all of our places, it means that he came to enable us to live victorious lives, no matter what kind of past we may have. Which is why I can say with great certainty that Chrisitianity then is the cure for sin nature, while everything else just masks it.
Now I have to address another misconception:
the individual is not accountable for his/her own actions, but instead their sins are transferred to Christ
This is not the case. If you sin as a Christian (and I can very much attest to this) then Almighty God will respond to that sin. It's called chastening:
'For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
But if ye be without chastisement, whereof all are partakers, then are ye bast-ards and not sons.
Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?
...
Now no chastening for the present seemeth to be joyous, but grievous: nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby.'
Hebrews: 12: 6-9, 11.
I don't get faith only based religions. Laws, rules, and regulations are undeniable need of human, why would God made such complicated world and leave His believers without a framework on laws, rules, and regulations to manage their society?
Well, from a Christian perspective, God sent Christ into the world to die for all of mankind, so that he can first save us from our sins. When you accept Christ, God changes your nature. We are all born with a sin nature, a natural inclination to do that which is wrong. When you accept Christ, he comes to live within you, and he lives his perfect life through you, enabling you to live a victorious and sin free life, no matter what kind of past you may have.
Now, when Christ returns to the Earth, he will establish the kingdom of God. It is during the thousand year reign of Christ when God himself will establish his sovereign government over all those who are his. Man in his supremely fallen state can not live under a spiritual kingdom in God's eyes.