If I used standard deduction and did not itemize last year, can I use the donations to church from 2021 as a cash donation carryover if I itemize this year?

No.  Since you did not itemize your deductions on the 2021 tax return, none of the 2021 donations can be entered on your 2022 tax return.  Only donations made in 2022 can be entered as an itemized deduction on the 2022 tax return.