You can't back up belief in Jesus' resurrection or God because you havn't seen them and yet you realise there is more to belief than seeing what is right in front of you. ....
So by your logic, you have no knowledge, no learning, no truth, because you have not experienced, tested, or proven all things that you have ever read or heard, at any place or any time.
And as to the resurrection of Jesus, there were many infallible proofs to His resurrection shown to many witnesses of His resurrection, as is written, and
I am a witness of His resurrection power in my life, as He lives in me since He regenerated me in Spirit and joined me to His family, by the adoption which is called second birth of Spirit, into the New Man Living Spirit.
Act 1:3 To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
The wonderful thing about the proof of the resurrection of Jesus is that He offers it, personally, to "whosoever will" call on His name to be saved, and each one who does so, in truth, from their heart, is made a "witness, and by regeneration of Spirit the Torah/Word/Christ is "sealed in their hearts", as was typed in the oracles committed to the namesake people of the New Man name.
Exd 25:21 And thou shalt put the mercy seat above upon the ark; and in the ark thou shalt put the testimony that I shall give thee.
The New Man body of Christ come in flesh is the True Mercy Seat, typed by solid gold in the living oracles committed to the namesake people of the New Man name. Each born again in Christ believer is placed in the true Ark, which the covering of is the Mercy Seat body of Christ come in flesh as our Atonement and "Door" into Life.
While we wait, covered by our Head, the Christ come in flesh, we are His "pupa" =disciples, who are awaiting metamorphosis into the regenerated =dissolved and reformed in elements, glorious New Man image of the New Man, made for the glory to indwell -now
that is
true science, worth learning and
experiencing.
Rom 3:25 Whom God hath set forth [to be]
the Mercy Seat/hilastērion, through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
After the resurrection, each born again in Christ believer is placed as a member within the true Ark that was typed by Moses, and the true Witness and the true Torah/Word is sealed and bound in their "New Man" hearts.
Isa 8:16
Bind up the witness/testimony, seal the Torah among my disciples.
1Jo 5:10 He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son.