I was not religious and did not perform and follow teachings of Islam seriously. But I have been practicing Islam alot from last 6-7 months Allahumdulillah. After I turned started practicing islam I have started to have a lot of evil and bad waswasas about Allah and Prophet SAW which I can't even share with anyone.

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This is normal. You are on the right path, so it is normal that evil works to get you away, back to the wrong path.
You need to fight him, and not listen to him.
If you have any questions, you can ask.