In this context, "back when" means "a long time ago when." "back when I was a kid" > "a long time ago when I was a kid"

Hi Seo-ko Lee! "It's been too long since my last confession. My dad, he used to come to this church back when I was a kid." --- Daredevil season1 script ----- *** This is spoken communication in English, thus informal. In spoken, there would be a pause after saying the first phrase. "My dad, he used to come to this church(short pause) back when he was a kid." [referring to his past experience, remembering his old memory of some sort] "My dad, he used to come to this church back when he was a kid." ALSO, it could be said as: "My dad, he used to come to this church way back when he was a kid." Hope this helps. Have fun!

My dad, he used to come to this church back when I was a kid. Note: - the word "back" here denotes the past. - the speaker is talking about his childhood days.

Hello, It is used in the structure - COME BACK meaning to go back somewhere , to return. Gramatically in this structure we include the place where we come back in the midle between COME and BACK. The word back has 4 uses in speech; Noun Adjective (Adds to a noun or object) Verb Adverb (Adds to a verb) Here it is adds to verb. But also you can say: come back to the church Hope it was helpful. Bye

Hi Seo-ko Lee! "It's been too long since my last confession. My dad, he used to come to this church back when I was a kid." --- Daredevil season1 script ----- *** This is spoken communication in English, thus informal. In spoken, there would be a pause after saying the first phrase. "My dad, he used to come to this church(short pause) back when he was a kid." [referring to his past experience, remembering his old memory of some sort] "My dad, he used to come to this church back when he was a kid." ALSO, it could be said as: "My dad, he used to come to this church way back when he was a kid." Hope this helps. Have fun!