The pagans are not a significant political threat to Islam the atheists are.
I use the two terms interchangeably. Formally, people may be atheist, and not believe in a deity, but in reality they still accept various sources of morality. A source of morality or law, is a (false) god. Hence, these atheists are almost always pagans worshipping false gods.
Judaism and Christianity has fallen to them ...
To an important degree, yes. Completely? I don't think so. Furthermore, atheists can take over for example 50% of a religion.
On the long run, it does not matter. Atheists fail to reproduce sufficiently from generation to generation. Any birth rate below 2.1 children/woman is a dead end activity. Below that rate, that population will just die out. It will just go the way of the dinosaurs.
Since, atheists are unlikely to produce by themselves the progeny to transmit their false beliefs to, it is just a question for the believers of keeping them away from their children. With the National State under atheist control, it means that the believers should not agree to send their children to State-controlled or State-regulated schools. If they have no other option than doing that anyway, in that case, they should oppose the school's atheism as much as they can, by teaching their children to reject it.
... and Islam is not far behind ...
It is always a battle for the hearts and minds of the next generation. Almost everybody agrees that there is a resurgence of Islam ongoing now.
Say that 1 woman could have 12 children, in which you have 6 daughters, who have 12 children again. That means that a grandmother potentially represents 6 x 6 = 36 granddaughters. If the atheist grandmother only produces 2.1 children -- which she doesn't -- her 1 atheist granddaughter will be facing 36 Muslim granddaughters. As you can see from the dynamics, in just two generations, it is absolutely possible to take over demographically. All you need to do, is NOT to use contraceptives. No other needs. No other requirements. That alone guarantees victory in less than 50 years.
The war is won by the desire of women to breed. The men are needed, in order to protect them while they are raising their brood, but in essence, men are disposable. The number of men is immaterial to the birth rate. If there is a shortage of men, just regroup the women by 3 or by 4 to 1 men. The fact that a woman has 12 children, proves her faith in the singular God.
In other words, atheism is a lost case. The only chance they stand, and the only option they have, is that your own children believe them, and therefore switch over. That is why you must keep an eye on the schools, and demonize the atheist school's evils in the eyes of your own children.
Hence, it is sufficient to truly believe in the singular God, to attain victory. Victory is always the result of pure faith and patience. If you do not believe that you will win, you will indeed lose, because it is a self-fulfilling prophecy. I have noticed that quite a few "moderate" Muslims are not such strong believers. They doubt. Unfortunately, it is the doubt itself that will cause trouble. It is the doubt itself that will lead to defeat.