If the church you attend that is a recognized 501(c)(3) organization, you can deduct your donations to the church. You are also able to deduct donated goods to Goodwill Industries (as it is a well known charitable organization).
You may also be able to deduct mileage to your church. See the explanation from IRS Publication 526 below:
You can deduct as a charitable contribution any unreimbursed out-of-pocket expenses, such as the cost of gas and oil, directly related to the use of your car in giving services to a charitable organization. You can't deduct general repair and maintenance expenses, depreciation, registration fees, or the costs of tires or insurance.
If you don't want to deduct your actual expenses, you can use a standard mileage rate of 14 cents a mile to figure your contribution.
You can deduct parking fees and tolls whether you use your actual expenses or the standard mileage rate.
You must keep reliable written records of your car expenses.
The determining factor is whether you were giving service while you're attending service. So, if you also teach a Sunday school class or do some other service as a volunteer, you can deduct the mileage. You cannot claim the mileage if you attend as a parishioner.