Is it natural for a child to believe in magical entities like Santa and God?

YES FOR AWHILE FOR SANTA who is not real BUT FOREVER FOR GOD WHO IS REAL...GOD IS ABOVE MAGIC...HE HAS ALL POWER AND IS SUPREME AND MADE THIS WORLD AND US!

Only Santa, because he is real!!!

Ya, it is completely natural, and it is a great thing. They look at the world so positively that they think there is something magical out there. 

No, it isn't. A baby is born ignorant of everything. He/she has to be taught about truths like health, obedience, telling the truth, and God. And some of them are also taught about myths, like Santa and the Easter Bunny.

Well I guess if it was “natural” they'd think it up for themselves (without being told).

It seems to me “natural” that a child believes those things adults they trust tell them. I guess that if they didn't there would be a lot more accidents involving children who, really, know nothing about the world.

no           .

See the answer by Tengu? Their icon is a devil. This is common.
Santa has all the letters for Satan, is is a consumer holiday for shopping, which contributes to the destruction of the world, which is your only life.

Jeremiah 10:3 "For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe.

4They deck it with silver and with gold; they fasten it with nails and with hammers, that it move not.

5They are upright as the palm tree, but speak not: they must needs be borne, because they cannot go. Be not afraid of them; for they cannot do evil, neither also is it in them to do good."
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If you go outside, in to the world, and exercise your free will, which is untouched by mankinds hands, you will certainly discover that this world is created. It is not the mathematical chaos "all". It is a cradle of duality. Pairs of opposites.
The momentum of the quantum existence, you can let go and become synchronized with it, which will open a higher reality to you.
I didn't read this. I've lived this.
MOST will not read the scriptures. And the blind and illiterate can not read them to begin with.
The true "religion" is in your mind and heart, if you can bear to break your self from the system which is manmade.
The scriptures are there to remind those who seek of the truth.
Ask a modern christian to tell you of the verse I just quoted in Jeremiah. Test them.
They do not represent the scripture, nor do they represent God.
They are people, who have much to say and many opinions.
The Lord tells to use reasoning.
So USE IT, because you don't need to be told this to reason anyway.
The scriptures are there to remind those who seek. They are not there for those who do not read them, and go to churches which take every line out of context without reading through it all, including the original language they were written in.
but, everyone wants to hear what they want to hear anyway, so why am I on here typing this to deaf ears and numb minds, who are rebellious to their own reasoning and to their own freedom.
You're not free. You're locked in a manmade cage which will break you.
and you think you'll be rewarded with money and shiny things.
See if money will buy you another life.

Unnatural and unhealthy.

They are told to believe. Yet, various cultures believe in God(s). So, mankind seems to need a father image, who is in control even when they are adults.

SANTA IS really the god of this world along with a number of other titles given to him by the AUTHOR OF THE BIBLE, you dear old S-A-N-T-A is just another way of saying dear old S-A-T-A-N  I think everyone on earth who is an English speaker should have really worked this out by now.

It happens all the time. Kids like to believe in fairies. But it becomes a problem when they do so into their later years. It's like not getting out of your shirt pants for your long ones, mentally speaking.

 2"And He called a child to Himself and set him before them, 3and said, “Truly I say to you, unless you are converted and become like children, you will not enter the kingdom of heaven. 4“Whoever then humbles himself as this child, he is the greatest in the kingdom of heaven. 5“And whoever receives one such child in My name receives Me; 6but whoever causes one of these little ones who believe in Me to stumble, it would be better for him to have a heavy millstone hung around his neck, and to be drowned in the depth of the sea." (Matthew 18:2-6). 

Are you current on your 'swimming with millstones' continuing education credits?