There is a difference between proof and evidence.
No one can prove Christianity but no one can disprove it and there is much evidence that it's true.
Faith is not blind - there is much great evidence that our faith is based on logic and truth and not just blind. Evidences: Jesus, Resurrection, changed lives, etc. (preachology.com)
“Faith must have adequate evidence, else it is mere superstition.” - A.A. Hodge.
Act 14:17 (GNB): “But he has always given evidence of his existence by the good things he does: he gives you rain from heaven and crops at the right times; he gives you food and fills your hearts with happiness."
“Failure to believe stems from moral failure to recognize the truth; not from want of evidence, but from willful neglect or distortion of the evidence.” - D.A. Carson.
Act 17:31 (CEV): “He has set a day when he will judge the world's people with fairness. And he has chosen the man Jesus to do the judging for him. God has given proof of this to all of us by raising Jesus from death.”