How do I know that I've often and persistently chosen to neglect the ways of life and goodness, that I've been ungrateful of the good things I've been given? ... Do you claim not to know this about yourself?
How do I know that humanity has messed up and become perverse? ... Do you claim not to know this about humanity?
How do I know that there are good things in life, in experience, in consciousness, in my appreciation that some things are better than others? ... Do you claim not to know these good things?
How do I know that I am fickle in my commitment, my tendencies, towards good things? ... Do you claim to be consistently oriented to what is good, to life in all its beauty?
How do I know that if it were up to me on my own merits by my own heart's inclination I would waver and take what is worse instead of what is best, and in the course of eternity fail to find eternal goodness? ... Do you claim to be sufficiently better?
How do I know that I do not deserve eternal bliss? ... Do you think you are owed eternal bliss?
My heart is no more hardened towards christianity that yours is towards Islam or Hinduism
There are some excellent books on evidence from early Christian times. The earliest materials we have on Christianity, from Christians themselves, are within a few decades of the time of Christ's life, death, and resurrection.
Islam and Hinduism are not at all equal. The documents about Mohammad or about early Hindu history are separated from the times of the original writers by many centuries, for starters. Also, the quality of the material is far inferior to the quality of the Biblical texts. Neither Islam nor Hinduism claims or provides such evidence as the New Testament provides.
If you are interested in this you might want to read "The Case for the Resurrection" or "The Case for the Real Jesus" by Lee Strobel.
Making mistakes, and succumbing to the sinful nature (which he created us with) in the course of our time on earth couldn't possibly merit an eternity of punishment. You're putting God on the same level as someone who thinks execution is an appropriate punishment for stealing a loaf of bread.
You seriously underestimate the nature of our mistakes and the gravity of our sins.
To sin is to rebel against the source of all good things, to choose alienation from goodness. To then demand good things and good states of mind, etc., as if it were a right, when we commit treason against the source of all goodness is not reasonable nor an honest emotional reaction.
We choose to go against our conscience and to be ungrateful. We choose to worship material things, worldly pursuits, and the approval of other human beings, instead of worshiping God. We choose the company of demons instead of the company of God. God is the author of all good things, but we wilfully rebel and choose our own way which is not good -- given the nature of our situation, we cannot expect and demand good things from God.
God has mercifully extended an offer to have it all forgotten so we can start over, and He did not owe us this offer.