Having political motivation is necessary for people from children to adults in order to think about their own future.

there are several ways that this could be changed, but something does need to be added there

another idea:

our own future

Even though there are some conflicts of opinion about the economy ofand religions, violence is absolutely wrong.

if "economy" and "religion" are two separate topics, they should be separated, probably with the "and" like above. also, religion does not need to be made plural in this sentence.

Having political motivation is necessary for peopleeveryone, from children to adults, in order to think about their own future.

While "people" isn't strictly wrong, "everyone" is a more natural word choice here. "from children to adults" is a subordinate clause so should be surrounded by commas

Even if there are some conflicts of opinion about the economy ofr religions, violence is absolutely wrong.

Having political motivation is necessary for people from children to adults in order to think about their own future.

Even if there are some conflicts of opinion about the economy ofr religions, violence is absolutely wrong.

1. "Economy of religions" seems like kind of an odd thing to highlight, so I'm wondering if the "of" was a typo of "or". If not, and you were talking about how different religions use money/affect the economy, then you could just say

"Even if there are some conflicts of opinion about how religious organisations handle money, violence is absolutely wrong"

or something like that.

2. Some smaller points - you could use "differences" instead of "conflicts" if you want it to sound a bit softer or less formal. When referring to a country's economy, you use "the economy" instead of just "economy". Finally, "religion" is often used even when talking about "religions" in general.