There are verses in the Quran such as 9:123 and others which say that Muslims should fight non-Muslims. You do not have to be an extremist or radical. Any good Muslim who follows the Quran is told to fight non-Muslims.
People will try to justify hating it due to the Quran because there's some bad stuff in it. Yeah, like there isn't messed up stuff in the Torah, New Testament? Even some Hindu and Dharmic scriptures have messed up stuff in it. Those books have both good and bad stuff in it. They will say that Muslims should be punished for what their ancestors did, but that's not good either. You don't punish people for what their ancestors did. This book was written over a thousand years ago and Islam today is not the same as it was before and not all follow it to the letter. It was written by multiple people, too, like the Bible. Some authors were peaceful and others were control freaks. But here's a few things to look at here.
"If it had been thy Lord's will, they would all have believed,- all who are on earth! wilt thou then compel mankind, against their will, to believe?" [The Qur'an 10:99]
Apostasy is a topic that can get confusing, especially since in Islam it's not merely the change of ones religion. In the Qur'an for example, it is stated over and over again that there is no compulsion in religion. You simply are not allowed to make someone believe against their will. (I gave one example above, there are others I can share if anyone is interested)
The topic of rejecting religion after being a believer is also mentioned in the Qur'an, but not once is a worldly punishment prescribed for it. For example one verse states:
"Indeed, those who have believed then disbelieved, then believed, then disbelieved, and then increased in disbelief - never will Allah forgive them, nor will He guide them to a way." [4:137]
As you can see it talks about disbelieving after believing over and over again but it never talks about punishing those people in this life. Actually, if people were killed for merely leaving the religion, how can they believe and disbelieve then believe and disbelieve again? Wouldn't they be already dead?
The confusion actually comes from a number of saying by Muhammad about people committing ridda and that they are to be executed. Thing is these sayings were about people who didn't just leave the religion, but they also joined the other side which was fighting Muslims at the time. (In early Islamic history Muslims were persecuted against by the Arab Pagans) In some of these sayings it becomes more clear that it's not just someone who leaves the religion, but someone who acts against the nation. In short, it's someone committing treason in terms we use today.
So as you can say, if you combine the fact that the Qur'an itself speaks against compulsion in matters of religion, with knowing a bit of history behind these sayings it becomes clear that there is no execution for the mere leaving of Islam.
"There shall be no compulsion in the religion. The right course has become clear from the wrong. So whoever disbelieves in Taghut and believes in Allah has grasped the most trustworthy handhold with no break in it. And Allah is Hearing and Knowing." [2:256]"
Pay the poor-due. 2:43, 110, 277
Be good to parents, relatives, orphans, and the needy. Speak kindly and pay the poor-due. 2:83
If you believe it, prove it. 2:111
The Jews say the Christians are wrong, and vice versa. Yet they both believe in the Scriptures. 2:113
Give of your wealth to family, relatives, and the needy. Set slaves free. 2:177
Do not fight wars of aggression. 2:190
"Do good." 2:195
Spend your money for good: to help your parents, your family, orphans, wayfarers, and the needy. 2:215
Help orphans. 2:220
"Make not Allah, by your oaths, a hindrance to ... making peace among mankind." 2:224
"If the debtor is in straitened circumstances, then (let there be) postponement to (the time of) ease." 2:280
Don't argue about things that you know nothing about. 3:66
Do not be guilty of usury, doubling and quadrpling the sum lent. 3:130
I suffer not the work of any worker, male or female, to be lost. Ye proceed one from another. 3:195
Help orphans and don't steal from them. 4:2, 4:10
Men and women proceed from one another. 4:25
"Kill not one another." 4:29
Be kind to parents, relatives, orphans, the needy, neighbors, and travelers. 4:36
Whoever participates in a good cause, will be rewarded. Whoever participates in an evil cause, will bear the consequences thereof. (It's not true, but it's a nice thought.) 4:85
If someone says Hi to you say Hi (or Howdy) back to them. 4:86
It is good to help the poor and make peace. 4:114
Value justice, for both poor and rich, even when it adversely affects you or your family's interests. 4:135
Don't lend money at unfairly high rates of interest. 4:161
"O People of the Scripture! Do not exaggerate in your religion."
Other translations render this "O people of the Book, do not be fanatical in your faith." (Amen to that!) 4:171
Don't hate other people. Treat everyone fairly. 5:8
Whoever kills a human being, it is as if he had killed all mankind. Whoever saves the life of one, it is as if he had saved the life of all. 5:32
Pay the poor-due. 5:55
Feed and clothe the needy. Set a slave free. 5:89
Do good to parents, don't kill your children or other living things unnecessarily. 6:151
Don't steal from orphans. Don't cheat or lie. 6:152
Pay the poor-due. 7:156
Be kind and forgiving toward others. 7:199
And if they incline to peace, incline thou also to it. 8:61
Men and women are protecting friends of one another. They enjoin the right and forbid the wrong, and pay the poor-due. 9:71
"We see thee [Noah] but a mortal like us, and we see not that any follow thee save the most abject among us, without reflection. We behold in you no merit above us - nay, we deem you liars." 11:27
"Do not evil in the earth."
Treat people fairly, respect their possessions, and avoid evil. 11:85
Be kind to your relatives. 16:90
Be kind to your parents. Treat them with respect in their old age. 17:23
Help your family, the needy, and wayfarer. Don't selfishly squander your wealth. 17:26
Don't kill your children to avoid falling into poverty. 17:31
Don't steal from orphans. 17:34
Don't follow what you don't know. 17:36
"Speak that which is kindlier." 17:53
"Increase me in knowledge." 20:114
Feed the poor and unfortunate. 22:28
Don't lie. 22:30
Be kind to others, forbid injustice, and pay the poor-due. 22:41
Pay the poor-due. 22:78
Pay the poor-due. 23:4
Repel evil with that which is better. 23:96
Pay the poor-due. 24:37, 24:56
"And such of your slaves as seek a writing (of emancipation), write it for them if ye are aware of aught of good in them, and bestow upon them of the wealth of Allah which He hath bestowed upon you. Force not your slave-girls to whoredom."
Allah encourages you to set your slaves free if they are good enough. And don't pimp out your slave-girls (concubines). 24:33
Repel evil with good. 28:54
Be kind to your parents. 29:8
Men and women should help each other with love an mercy. 30:21
Help your family, the needy, and wayfarers. 30:38
Pay the poor-due. 31:4
"Be modest in thy bearing and subdue thy voice." 31:19
"Speak words straight to the point."
Say what you mean; mean what you say. 33:70
Good and evil are not the same. Repel evil with goodness. That way your enemies will become your friends. 41:34
Be loving and kind to your relatives. 42:23
It is wrong to oppress people. 42:42
Live peacefully with disbelievers. 43:88-89
Be kind to your parents. 46:15
Don't defame, insult, spy on, or backbite one another.. 49:11-12
Give of your wealth to help the poor. 51:19
"A guess can never take the place of the truth." 53:28
Pay the poor-due. 58:13
Pay the poor-due. 73:20
Don't defraud. 83:1-3
Free a slave, feed the hungry, and exhort one another to pity. 90:13-17
Don't oppress orphans or drive away beggars. 93:9-10
Pay the poor-due. That is true religion. 98:5
Let each person believe (or disbelieve) whatever he or she wishes. 109:1, 6