Okay, I totally agree with you here.
Then I would think you would agree that to be rational/logical, a negative must usurp from a positive and that a positive does not usurp from a negative, hence life does not exist to create death anymore than the Truth exists to create a lie to undermine it. In the most basic truism of thought, The Truth must exist first before a lie. Wherefore a negative usurps from a positive.
Even if Christianity does give you a rational reason for temporal existence, I don't see how that (or anything, really) makes the resurrection (of Christ, and by extension, our own) easy to believe in.
The reason is because Love/empathy is a positive in the narrative. Fundamentally the Gospel presents that either I believe that Love/empathy is an attribute of the Creator manifesting in the creature or an attribute of the creature apart from any self aware Creator. In either case empathy is a positive, but only in a worship of self does it become vain and corruptible. Moreover the Love/empathy displayed on the cross is extreme in an endurance and perseverance through suffering only for the sake of forgiveness. It therefore represents a purity that is not worship of one's self when believed upon and points to coming from somewhere higher than ourselves.
Ultimately the Gospel is not presented to be tested and proved, but rather we are judging ourselves. To the faithful in regards to valuing empathy as the attribute of God, it therefore trends towards believing that everything learned in the experience of a temporal existence in regards to the value of Love/empathy is not futile, since it's the Spiritual knowledge of God as a Person not a thing.
However the mind cannot hold on so easily to the hope/belief without comprehending a spiritual terminology that occurs in our psycholinguistics since the term 'believe' also carries a carnal denotation of 'superstition' which in application implies God as not existing. If we have a carnal definition of the term 'believe' in our mind that subconsciously denotes God as non-existent, then believing in the resurrection becomes untenable in one's heart.
And this is why I can view the resurrection as a perfectly rational necessity in a trust not dissimilar to Good will overcome evil for example, or that justice somewhere and somehow prevails over injustice. Likewise according to the spiritual denotation it's illogical to not believe/trust in Love/empathy as an attribute of the Creator Who brought forth Life so that we may know Him, which is a purpose that would be futile otherwise. In essence it's logical to trust in something pure and enduring rather than trust in the thing that corrupts it.
Try to read the following scripture with the understanding that the Gospel presents that either empathy/Love is an attribute of God manifesting in the creature or an attribute of the creature apart from any self aware God.
Romans 1:16-23
16 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;
19 Because that which may be known of God is manifest in them; for God hath shewed it unto them.
20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
21 Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
22 Professing themselves to be wise, they became fools,
23 And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.