but it's not true.
for your general reference...
egg painting is an ancient indo-european practice. actually. like the goddess of the dawn, ostara, it shows up all over the place in indo-european religons. for example, it's a key tradition in the zoroastran nowruz festival, which has roots in the indo-aryan period. spring equinox egg painting was certainly normal in ancient persia, before anything - before christianity, before reformed judaism, before the jews even returned after the captivity. this is amongst the oldest traditions in the world. it wasn't invented by american capital.
it shows up in baltic and slavic pagan traditions. prominently.
and there's really every reason to think the ancient germans, including the ancient angles and saxons, had some egg-painting practice, even if the christians made sure to destroy any record of it.
this information is easily googleable.
don't believe the christians. they're the fucking worst.