Thank you for your question and first of all I was not a practicing Hindu but I did believe in karma along with reincarnation in that I would be judged after this life.
My shift to Christianity was that I know longer lived in fear and that I had security now. Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ. Romans 5:1 It is the peace of Christ that changed everything for me!
I guess the big difference from my old worldview and Christianity would be that I “hoped”I would have eternity but when I met Christ I was “certain” that I had it.
“My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand.”
John 10:27-28 ESV
Personally some of the challenges that I went through was the feeling of guilt and remembering my past but I’m able to remind myself that, “There is therefore now no condemnation for those who are in Christ Jesus. Romans 8:1 ESV .
My advice for Christians to Hindus is to read about Hinduism but more importantly to find out more about the person that you’re actually speaking to you face-to-face. Ask about their personal life and their personal journey and what do they actually believe? Again here at RZIM Ravi has taught us to ask the four big questions: origin, meaning, morality and destiny.
I hope this helps.
Saved by Grace,