It's a normal part of Christian belief and biblical teaching, e.g. 1 John 2:18, 22:
18 Children, it is the last hour; and just as you have heard that the antichrist is coming, so now many antichrists have appeared. This is how we know it is the last hour.
...
22 Who is the liar, if it is not the one who denies that Jesus is the Christ? This is the antichrist, who denies the Father and the Son.
It has also always been a Christian belief that Jesus will return, the current world system will end, and God will establish new heavens and a new earth.
2 Peter 3 talks about this. It's too long to quote the whole chapter but here are some call outs.
4 “Where is the promise of His coming?” they will ask. “Ever since our fathers fell asleep, everything continues as it has from the beginning of creation.”
...
8 Beloved, do not let this one thing escape your notice: With the Lord a day is like a thousand years, and a thousand years are like a day. 9 The Lord is not slow in keeping His promise as some understand slowness, but is patient with you, not wanting anyone to perish but everyone to come to repentance.
18 Children, it is the last hour; and just as you have heard that the antichrist is coming, so now many antichrists have appeared. This is how we know it is the last hour. ... 22 Who is the liar, if it is not the one who denies that Jesus is the Christ? This is the antichrist, who denies the Father and the Son.
It has also always been a Christian belief that Jesus will return, the current world system will end, and God will establish new heavens and a new earth.
2 Peter 3 talks about this. It's too long to quote the whole chapter but here are some call outs.
https://biblehub.com/bsb/2_peter/3.htm
4 “Where is the promise of His coming?” they will ask. “Ever since our fathers fell asleep, everything continues as it has from the beginning of creation.” ... 8 Beloved, do not let this one thing escape your notice: With the Lord a day is like a thousand years, and a thousand years are like a day. 9 The Lord is not slow in keeping His promise as some understand slowness, but is patient with you, not wanting anyone to perish but everyone to come to repentance.