“This gospel of the kingdom will be preached in all the world as a witness to all the nations, then the end will come.” – Lord Jesus Christ (Matthew 24:14)

How will it be fulfilled if Christians are not even allowed the basic human rights to preach in so many countries? (but the opposers can preach & practice their faiths in “Christian majority countries” such as America & Europe).

Simple answer:
You can only stop “men” (Christians) but your entire army is no match for “one” Angel of Christ who will fulfill it as the verse below declares in all truth the fulfillment of the prophecy of the Lord above:

“And I saw another Angel flying in mid-heaven, having the age-during Gospel to proclaim to those dwelling upon the earth, and to every nation, and tribe, and tongue, and people,” (Revelation 14:6)

And it’s easy to read in the Book of Revelation of Lord Jesus Christ that the world as we know it comes to an “end” after that as He Prophesied in Truth.

No one can stop Him because His method is not man (as commonly erred). The Armies of Heaven will fulfill the remaining prophecies as it is written.

P/S:
You can’t behead an angel let alone catch him first.

And this will come to pass too:

A message to those who oppose God:

“Why do the nations conspire

and the peoples plot in vain?

The kings of the earth rise up

and the rulers band together

against the Lord and against his anointed, saying,

“Let us break their chains

and throw off their shackles.” (Psalm 2:1 – 3)

God’s response to their “evil plans against Him”? He laughs

“The One enthroned in heaven laughs;

the Lord scoffs at them.

He rebukes them in his anger

and terrifies them in his wrath, saying,

“I have installed my king

on Zion, my holy mountain.” (Psalm 2:4 – 6)

What happens to his enemies?

“You will break them with a rod of iron;

you will dash them to pieces like pottery.” (Psalm 2:9)

So be warned:

“Kiss His Son, or He will be angry

and your way will lead to your destruction,

for His wrath can flare up in a moment.

Blessed are all who take refuge in Him.” (Psalm 2:12)

P/S 2:

If you notice, the True and Living God doesn’t use “any human army” to fight for Him.
He Himself will dash them to pieces.

Only weak and false gods (who are not really gods) need men to fight on behalf of them (think carefully and you’ll see this truth).

That’s why there is no mention of a “Christian army fighting for God” in the entire Bible.

Men in the Bible fought for their own families, race and nation (that is, for their survival; not for God).