Yeah, though the parents sometimes say "let them choose in
future", will happen or not? Then if the child/ren choose/s one
parent's religion over another, the other parent will probably be
upset. Might be worse if the child/ren grow/s up, and the parents
get old. We all know old people can get more stubborn as time
passes...of course there are young stubborn people too......
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Children aside, disagreements might be rife. One party may not
like the items the other party puts in the house, one party may be
resentful that the other chooses to go for religious activities
over spending time with the former, etc...