My Catholic sister wants to attend a Pentecostal service with me?

Hi, my sister wants to attend a Pentecostal Church service after meeting a woman at the local sports centre who invited her there. My sister was very impressed with the lady and wants to attend the service, she asked me to go along with her.

My gut tells me not to go. Question am I allowed to participate in this type of service? How can I advise my sister? My sister and I are practising Catholics.

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