Located on the Membership tab, this Condition is looking at the Baptism Date on a person’s Member Profile tab. This is the date that the person’s Baptism Status has been changed to Completed and a Date selected. If you are using the Membership Process in TouchPoint, the Baptism Type will get set automatically once you mark the Baptism Status as Completed, otherwise, you will have to select the Baptism Type.
You can also find Baptism information (and drill down to the details in Search Builder) from the Decision Summary Report.
You want to find everyone who was baptized during 2015. Select GreaterEqual and the date 1/1/2015 and add to the group. Then select LessEqual and the date 12/31/20105 and add to the group. When you run the search, the results will be everyone with a Baptism Date from Jan-Dec 2015.