Does it matter which hand taps first?
Generally, it is best to start by tapping your dominant hand's middle finger into your non-dominant palm, then switch. However, the sign is perfectly understood regardless of which hand makes the first tap, as long as both palms are touched.
Why do we use the middle finger instead of the index finger?
The middle finger is traditionally used in ASL to represent feelings, internal states, or specific religious concepts like Jesus. Using the index finger changes the handshape entirely and might confuse the viewer, as the index finger is usually used for pointing.
Can I sign this with just one hand?
No, 'Jesus' is strictly a two-handed sign. Because the sign visually represents the nails in both of Jesus' hands, using only one hand would lose the meaning and iconic nature of the sign. Always use both hands to tap each palm.