Well, historically, there was a man called Jesus Christ. The records and eye witness testimonies of His life are exactly in line with the prophesy of the Old Testament scriptures. His death on the cross is a historical fact as well. No hard evidence till date has been produced to refute His resurrection from the dead (all Romans had to do was produce His dead body)...His testimony about Himself was backed up by both the scriptures and the works He did.
If that isn't evidence enough for you to at least consider and evaluate before lumping Christianity as another delusion, there is absolutely nothing that can be said to you.
God bless you.