@Arjuna,
Well, the problem with 'a greatest sense of well-being' is that it inevitably finishes. It might be satisfactory when your circumstances are fortunate, and you do indeed have a nice garden, and friends to admire it with.
Regrettably, life is often not the proverbial 'bed of roses'.
I do feel your depiction of Christianity is facile, to put it politely. I would hope that those who believe in Christ would also believe that he was a human being who understood something marvellous about - well - being human. I mean, apart from His crucifixion, which I see, perhaps incorrectly, as an extremely tragic event, He also left many sayings and teachings which have become part of the 'global consciousness' since that time.
Also, I don't really accept that the Christian faith is superstitious, per se. Religious belief and superstition often intermingle, but I hope that the principles of the Christian faith, in common with those of other spiritual teachings, would be rather more than simple superstition. I would hope, and in fact I do believe, even though I don't call myself Christian, that The Christ is a living principle, not simply an idol or a superstitious belief, with which the devotee feels that he or she has a living relationship which is a source of joy.
It is true that the Greek philosophers, Epicurus included, have a great deal to teach, and that the philosophical life is certainly superior to life as it is normally lived in Consumer Land. It is also true that the cultivation of equanimity and indifference to the slings and arrows of fortune denotes an excellent temperament. But I don't know if I would set the Greek wisdom against the teaching of the Gospel. Many have found that they actually complement each other rather well.