Can you be Jewish by blood but not by religious beliefs?

I was raised in a Christian home but since then neither of my parent or me are religious. I haven’t seen my moms family since I was young since they all live far away. I am adult now and we went to a family reunion on my moms side and to my surprise my moms family are all Jewish I never remembered this when I was younger. They were explaining to me even though I’m not Jewish religiously that I will always be Jewish by blood and my kids are also Jewish. I feel kinda dumb because I never knew this but now I am intrigued by the Jewish culture. What’s the difference of being Jewish by blood and religiously?

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