this is my thoughts, n its also a lesson i learn in real from my uncle.

doesn't matter which religion u are currently in, ur parents brought u up n it is important to respect their last request. if ur parents are buddhist, do it the buddhist way, n if they're christians, do it the christian way. it is still ur responsibility as a son to send them off the way they wanted it to be.

whether u want to hold the joystick or not... that is up to u n only u to decide. my uncle's a protestant n although there were christians against it, he still held the joystick n prayed the buddhist way to my grandparents. to him, its a matter or respect to his own family members.