(saying a prayer before leaving home for church)
‎"I'm grateful that I can pray on the Sabbath day morning."

Hello. Do you think the sentence above sounds natural? I said "on the Sabbath day morning " Can I remove "the"?

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@u-1 (sorry it took me so long to respond!) Sunday is used as the time marker, whereas the Sabbath is more of a subject/object in its entirety - Sunday is well known as the day of church and religion so you don't say Sabbath as a time. I've never thought about why, but that's what sounds natural.
So in conclusion:
Option 1: I'm grateful I can pray on Sunday morning.
Option 2: I'm grateful I can pray on the morning of the Sabbath. (Although technically correct, it's very wordy and almost redundant.)