Some matters cannot be explained in a few words; highly intelligent people spend years—indeed, their entire lives—trying to grasp the truth without ever fully finding it. That is where the principle of "accepting it by faith" comes in.
I am not the most intelligent person, nor do I measure up to many great Christian thinkers, but I will try to explain the reason for and purpose of Jesus Christ’s path as I understand it.

To begin, let us recall the wager between Aesop and his master, the philosopher Xanthus, regarding the challenge to "drink the sea."

No one can drink the sea, for countless tributaries flow into it—tributaries that no one can block—and so Aesop won the wager.

Now, let us turn to the Jews—the people chosen by God. They took great pride in this status and strove to fulfill the Law of Moses, yet they looked down upon other nations—calling them Hellenes or by other names—deeming them unworthy of God's attention.

God gave Moses the Law, yet not a single Jew could fulfill it; no matter how hard they tried, there was always an influx of sin and temptation—whether in the form of wealth, pride, or debauchery.

Jesus Christ was the only one who fulfilled the Law given by God, for it could only be fulfilled by the One who gave it to the Jews in the first place: God Himself.

The concept of the Trinity—Father, Son, and Holy Spirit—is very difficult to comprehend. Yet we, too, are complex beings, possessing mind, soul, and body. Jesus Christ also possessed a body—a body that was broken and sent to the cross as a sacrifice for the atonement of humanity's sins. Furthermore... among the Jews, only the High Priest had access to the Holy of Holies in the Temple; yet Jesus Christ tore down the veil between God and humanity. Now, anyone—not just a priest—can turn to God in prayer, and there is no need to offer a sacrifice, for it has already been made for each of us on the Cross.

Perhaps I haven't explained this as well as I could have; this is a topic vast enough to fill a hundred War and Peace novels—hardly something for a single comment :)

Oh, and one more thing: Jesus Christ never tried to "sell" anything or vie for attention; He left the choice of faith entirely up to those who listened to Him—He wasn't an entertainer at a children's party :)