The Bible has a scientific test how to identify a true christian believer.
“There will be signs for true believers and among the signs – In my name they shall cast out devils, they shall speak foreign tongues, new tongues, they shall take up serpents – And if they drink deadly poison, they shall not be harmed – And when they place their hand over the sick, they shall be cured.”
This is a scientific , it is known as the “confirmatory test for a true Christian believer“. I have not come across a single Christian who took poison and who has not died.
So a person who is not a true Christian believer, will never attempt this test.
All these evidences are not to hurt the feelings of Christians but to show the truth .