I think i may just give up on rugby league.

When you have Child reffing it's just not worth turning up. Three forward passes. None called. Three tries. The fact this man has a job in superleague is amazing.

Games reffed by Childs 11
Crusaders wins 0

?

If there was a better player, why would they be waiting behind him? Surely they'd already be in front of him?

If there was a better ref, why would they be waiting behind him? Surely they'd already be in front of him?

Perhaps the coach thought the starting player was better until he saw him make all those mistakes you posted about.

Or maybe fancied giving someone else the chance to develop and prove themselves and send a message that such incompetent standards would not be accepted?

No. Coaches never put someone out there just because they "fancied giving someone a chance"
Those chances have to be earned through training, and playing at other levels.