If you want to create a theory...please use any of these following texts if you want to be seen as credible atleast. Here are the texts and when they are dated.

30-60 Passion Narrative
40-80 Lost Sayings Gospel Q
50-60 1 Thessalonians
50-60 Philippians
50-60 Galatians
50-60 1 Corinthians
50-60 2 Corinthians
50-60 Romans
50-60 Philemon
50-80 Colossians
50-90 Signs Gospel
50-95 Book of Hebrews
50-120 Didache
50-140 Gospel of Thomas
50-140 Oxyrhynchus 1224 Gospel
50-200 Sophia of Jesus Christ
65-80 Gospel of Mark
70-100 Epistle of James
70-120 Egerton Gospel
70-160 Gospel of Peter
70-160 Secret Mark
70-200 Fayyum Fragment
70-200 Testaments of the Twelve Patriarchs
73-200 Mara Bar Serapion
80-100 2 Thessalonians
80-100 Ephesians
80-100 Gospel of Matthew
80-110 1 Peter
80-120 Epistle of Barnabas
80-130 Gospel of Luke
80-130 Acts of the Apostles
80-140 1 Clement
80-150 Gospel of the Egyptians
80-150 Gospel of the Hebrews
80-250 Christian Sibyllines
90-95 Apocalypse of John
90-120 Gospel of John
90-120 1 John
90-120 2 John
90-120 3 John
90-120 Epistle of Jude
93 Flavius Josephus
100-150 1 Timothy
100-150 2 Timothy
100-150 Titus
100-150 Apocalypse of Peter
100-150 Secret Book of James
100-150 Preaching of Peter
100-160 Gospel of the Ebionites
100-160 Gospel of the Nazoreans
100-160 Shepherd of Hermas
100-160 2 Peter

100-200 Odes of Solomon
101-220 Book of Elchasai
105-115 Ignatius of Antioch
110-140 Polycarp to the Philippians
110-140 Papias
110-160 Oxyrhynchus 840 Gospel
110-160 Traditions of Matthias
111-112 Pliny the Younger
115 Suetonius
115 Tacitus
120-130 Quadratus of Athens
120-130 Apology of Aristides
120-140 Basilides
120-140 Naassene Fragment
120-160 Valentinus
120-180 Apocryphon of John
120-180 Gospel of Mary
120-180 Dialogue of the Savior
120-180 Gospel of the Savior
120-180 2nd Apocalypse of James
120-180 Trimorphic Protennoia
130-140 Marcion
130-150 Aristo of Pella
130-160 Epiphanes On Righteousness
130-160 Ophite Diagrams
130-160 2 Clement
130-170 Gospel of Judas
130-200 Epistle of Mathetes to Diognetus
140-150 Epistula Apostolorum
140-160 Ptolemy
140-160 Isidore
140-170 Fronto
140-170 Infancy Gospel of James
140-170 Infancy Gospel of Thomas
140-180 Gospel of Truth
150-160 Martyrdom of Polycarp
150-160 Justin Martyr
150-180 Excerpts of Theodotus
150-180 Heracleon
150-200 Ascension of Isaiah
150-200 Acts of Peter
150-200 Acts of John
150-200 Acts of Paul
150-200 Acts of Andrew
150-225 Acts of Peter and the Twelve
150-225 Book of Thomas the Contender
150-250 Fifth and Sixth Books of Esra
150-300 Authoritative Teaching
150-300 Coptic Apocalypse of Paul
150-300 Discourse on the Eighth and Ninth
150-300 Melchizedek
150-400 Acts of Pilate

150-400 Anti-Marcionite Prologues
160-170 Tatian's Address to the Greeks
160-180 Claudius Apollinaris
160-180 Apelles
160-180 Julius Cassianus
160-250 Octavius of Minucius Felix
161-180 Acts of Carpus
165-175 Melito of Sardis
165-175 Hegesippus
165-175 Dionysius of Corinth
165-175 Lucian of Samosata
167 Marcus Aurelius
170-175 Diatessaron
170-200 Dura-Europos Gospel Harmony
170-200 Muratorian Canon
170-200 Treatise on the Resurrection
170-220 Letter of Peter to Philip
175-180 Athenagoras of Athens
175-185 Irenaeus of Lyons
175-185 Rhodon
175-185 Theophilus of Caesarea
175-190 Galen
178 Celsus
178 Letter from Vienna and Lyons
180 Passion of the Scillitan Martyrs
180-185 Theophilus of Antioch
180-185 Acts of Apollonius
180-220 Bardesanes
180-220 Kerygmata Petrou
180-230 Hippolytus of Rome
180-250 1st Apocalypse of James
180-250 Gospel of Philip
182-202 Clement of Alexandria
185-195 Maximus of Jerusalem
185-195 Polycrates of Ephesus
188-217 Talmud
189-199 Victor I
190-210 Pantaenus
193 Anonymous Anti-Montanist
193-216 Inscription of Abercius
197-220 Tertullian
200-210 Serapion of Antioch
200-210 Apollonius
200-220 Caius
200-220 Philostratus
200-225 Acts of Thomas
200-250 Didascalia
200-250 Books of Jeu
200-300 Pistis Sophia
200-300 Coptic Apocalypse of Peter
203 Acts of Perpetua and Felicitas
203-250 Origen

Here are some authors for you to read if you want to debate the historical Jesus. They all present different theses.

Jesus the Myth: Heavenly Christ

* Earl Doherty
* Timothy Freke and Peter Gandy

Jesus the Myth: Man of the Indefinite Past

* Alvar Ellegård
* G. A. Wells

Jesus the Hellenistic Hero

* Gregory Riley

Jesus the Revolutionary

* Robert Eisenman

Jesus the Wisdom Sage

* John Dominic Crossan
* Robert Funk
* Burton Mack
* Stephen J. Patterson



Jesus the Man of the Spirit

* Marcus Borg
* Stevan Davies
* Geza Vermes

Jesus the Prophet of Social Change

* Richard Horsley
* Hyam Maccoby
* Gerd Theissen

Jesus the Apocalyptic Prophet

* Bart Ehrman
* Paula Fredriksen
* Gerd Lüdemann
* John P. Meier
* E. P. Sanders


Jesus the Savior

* Luke Timothy Johnson
* Robert H. Stein
* N. T. Wright