JW's believe Christ has already returned; not physically they teach He returned spiritually in the early 20th century.
Your knowledge of the Bible is not very good. Gentiles were released from keeping the Law in Acts. There are specific signs of Christ's return and no century in the history of man has had all those signs until now. The Jews returning to Israel is one of those signs.
Dan 12:4
4 "But as for you, Daniel, conceal these words and seal up the book until the end of time; many will go back and forth, and knowledge will increase." NAS
2 Thess 2:3-4
3 Let no one in any way deceive you, for it will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of destruction, 4 who opposes and exalts himself above every so-called god or object of worship, so that he takes his seat in the temple of God, displaying himself as being God. NAS
It took centuries for our knowledge to double then knowledge increased at a faster pace. Now knowledge is doubling every 6 months.
Many so-called Christian churches have been teaching a social gospel for about a century, which introduced apostasy into the church. Now denominations are accepting gay theology and compromising God's truth falling deeper into apostasy.
2 Peter 3:3-7
3 Know this first of all, that in the last days mockers will come with their mocking, following after their own lusts, 4 and saying, "Where is the promise of His coming? For ever since the fathers fell asleep, all continues just as it was from the beginning of creation." 5 For when they maintain this, it escapes their notice that by the word of God the heavens existed long ago and the earth was formed out of water and by water, 6 through which the world at that time was destroyed, being flooded with water. 7 But the present heavens and earth by His word are being reserved for fire, kept for the day of judgment and destruction of ungodly men. NAS
Mock all you want you are only fulfilling Biblical prophecy.