Tithe and other donations are different.
I would claim other donations as those are NOT part of my tithe.
If I’m donating to the Boy Scouts or some other organization, certainly would claim the deduction.
My tithe though: no way.
You should not do anything that you are not assured in faith is not sin.
But some go by the tithe system and still use the Caesar deduction and that doesn’t make them out of the will of God since they come from the standpoint that Caesar is confidential and no glory comes to them personally thereby (the point of Jesus’ admonition, just like we don’t have to literally go into a closet for every prayer we pray).
And, that isn’t the government’s money. It’s the government’s forbearance with respect to your money when channeled in a certain fashion.