Well, as Pako says, all I can truly discuss are my own experiences.
Yes, my life is as truly great to me as I say it is. Why would it not be? You say you felt joy when you found Christ/God as the director of your life, and you seem to be expressing pity or sympathy that I do not share that joy. My joy is all the greater to me, because I have found myself as the director of my own life.
Some people feel lost in the real world, and need the rock of religion to stand upon, to give them firm footing. There are many reasons people feel this way; some stemming from religion itself, some not. There are an infinite number of reasons people feel this way, but ultimately it boils down to their mistrust of their own mind and its ability to understand what their senses show them.
I, however, and others who I am like do not feel lost in the real world. We feel at home, and the world we see is firm enough footing for our minds to operate upon. To us, the 'rock' of religion is not something to stand upon, but an unneccessary burden to bear. It interferes with our preception of reality, and our living within that reality. The joy that you felt as the influence of Christ was opened up to me on the night that I realized I didn't need to accept that burden, or any burden, that I didn't choose to accept. I am free to determine what I want, what I will need to do in order to get it, and to act accordingly.
You speak of a great transformation - I too felt a great transformation that gave me great peace and joy. It was not the relief of handing over control of my life to someone or something else, but the relief of knowing that I control my own life, myself, and that I possess the tools required to make my own life happy and satisfying.
The more I learn that reality is real, that my existence exists, that I am entitled to that existence and that I am free to make the way I choose through that reality, the happier and more at peace I become. I too have great reserves to draw upon, but those reserves come from within, not from above. I gain strength from the knowledge that I am the final arbiter of what I value, and of what I am willing to trade to gain that value.
I am strong in direct proportion to the extent that I refuse to fake reality. If I steal, I am faking the reality that I have earned that money. If I lie, I am faking the truth. If I live with the final goal of a supernatural 'heaven', I am faking the idea that I do not have to determine my own morality.
The more I do these things, the more I fake myself, and the weaker and unhappier I am. The more that I acknowledge reality, and my right to a place within reality, the stronger, happier, and more moral I become. Everything I need as a foundation, everything that I need to be happy, is contained in the following sentence:
"I swear - by my life, and my love for it - that I will never live for the sake of another person, nor ask another person to live for mine." --Ayn Rand