The problem with Christianity isn't that it has been tried and found wanting.
It is that it has been found difficult, and left untried.
G. K. Chesterton
Many of us have bad experiences with Christianity, whether it be from a specific church or family member or ministry, or maybe even looking out on the Body of Christ in general. To claim otherwise is to create a kind of immediate suspicion, the kind that seems to say that you're either naieve or hiding your head in the sand. However, to assume that this speaks for the validity of Christ as the only faithful Son of God is really to misinterpret both Christ's message and the nature of Christian experience.
On the rational level, Christianity is a religion based on the sheer divinity of Christ - the perfection of His example in both upholding the law and loving His wayward brothers. When He chastises the Pharisees saying that they should have had mercy, compassion, and justice on top of their sacrifices and prayers He is able to speak because He upholds both. This is rarely more apparent than in the Gospel of Mark: When Jesus landed and saw a large crowd, he had compassion on them, because they were like sheep without a shepherd. So he began teaching them many things. (Ch. 6 v. 34). This example carries more power in context, where the narrative shows this particular instance to have lasted roughly 12 hours and to have come directly after Christ attempt to have some time to spend with His disciples alone.
If we put together the unique aspects of each gospel account what we find is a teacher who baffles all standing authority with His dedication to righteousness, a servant who baffles all men with His willingness to deny Himself, and a man who extends mercy to everyone including His murderers. And it is this combination that is the rational basis of Christianity; the idea that Christ surpasses men in all virtues. His selflessness is not naivete, but dedication to the will of a Father who desires to bring all men back into communion with Him.
However, it is in John that the power and purpose of Christ are really fleshed out. Yes, all of the above things about service, righteousness, and caring are excellent virtues, and they help to raise Christ above the reproach of nearly every religious system. But people somehow always seem to find a hole to use these virtues to transform Christ from the only living Son of God into an especially enlightened teacher, political figure, or what have you. What we so often miss is that these things that Christ embodied are not simply qualities to be admired; they are living proof of real communion with God. One of Christ's running arguments was that no mere man could do the things that He advocated, and that this should convict us rather than motivate us. Don't emulate, humble yourself.
In the words of one RZIM pastor: "Christ did not come into the world to take bad people and make them good, He came to take dead people and make them live." It is in this statement that we see sin and human imperfection for what it is. It is not the failure to uphold a standard or set of rules, if this were true then certainly someone in the Jewish legal authority would have gotten it right. Rather sin is seperation from God, the gulf of willfulness that stands between us and divine blessing, purpose, fulfillment, and hope. This is an idea that extends all the way back to the beginning of the Torah and Genesis, where our progenitors decided that they could take for themselves what they assumed God was not giving them.
Therein lies the essence of sin. It is not what you do, not a moral accounting of your actions good or ill. Many Buddhists have moments of compassion and many Christians and supposed Christians have moments of indifference. It is the assumption that my destiny is my own, that I can make myself happier following my own devices than God can with infinite love, wisdom, and power. And truly, we are given the capacity to make our own choices and live our own lives, but at what price? How many of us can actually say that we know what's best for ourselves? The trails of mistakes, broken hopes, and forced choices we've all experienced really ought to tell us differently. Further, what hope is there in trial and error? I can avoid one mistake or two with the culmination of experience, but the frame of reference is still so limited.
Then there is always what might give us greater pause, what a former teacher of mine called slavery to our experiences. That we can indeed become the culmination of the conditions or the lot we've been dealt or created for ourselves. This is what Chesterton referred to as a man living in a box with the sun and stars painted on it. A reality constructed entirely of our choosing, one which is created to justify how we have lived and one which we become increasingly wedded to for fear that our world will come crashing down and we will be left with nothing.
This is the essence of seperation from God - a reality where God is replaced by either ourselves or our constructions. It is an existence where we are truly the highest beings in our own universe because we choose what to accept or allow into our personal realities and what to exclude. It is a world where we have infinite freedom to choose our beliefs but also infinite powerlessness to experience anything beyond ourselves; an empty and circular movement around our own egos.
"Jesus said, 'Father, forgive them, for they
do not know what they are doing.
'And they divided up his clothes by casting lots."
Luke 23:34