I’m not exactly sure what you were trying to say, but the formula is “I am” or “I was” singing. He/ she is/ was singing. Simple present is “I sing” or “I am (to be verb) singing. A blessing > noun; “bless” would be the verb. When asking a question, invert the order ... “Is it correct?” When it is a fact or statement: the order is: “It is correct.”

Today was great at church. I sang and I felt blessed. Is it correct?

Today was a great day because I went to church. I sang there and it was absolutely a blessing moment. Is it correct?

Today was a great day in church, I sang and was blessed or I felt blessed.