Many many lines of evidence.
For example we know that the Bible has two different and mutually exclusive accounts and so one or both must be wrong.
We also know that every other religion also has multiple mutually exclusive accounts and so they too must be wrong.
Finally, we have evidence of natural causes but no one has ever presented any evidence of any unnatural or supernatural causes.
Therefore, until someone presents some evidence of an unnatural or supernatural cause, all such assertions should be rejected as science.
Anyone so limited that they can only spell a word one way is severely handicapped!