The problem with "Christianity changed my life/got me off drugs/made me nicer, therefore Christianity is true" type reasoning
Often I see people making claims like "Christianity got me off drugs and alcohol, so I decided to join it", or "Christianity changed my life and the lives of people around me, so that makes it true and you should join it", or something similar.
That's wonderful that people got off drugs and alcohol because of Christianity or that they became more loving or whatever. But that by itself isn't evidence the belief system is true. Many people have gotten off of drugs and alcohol or have become nicer people because of Scientology, or Islam, or Mormonism. Should we conclude those belief systems are true as well?