Our Prophet (saas) said that some people in the end times would quickly lose their faith

Anas relates: "The Messenger of Allah (saas) said:

"Before the Day of Reckoning there will be fitna like parts of the darkness of night. (AT THAT TIME) A PERSON WILL SEE THE MORNING IN AS A BELIEVER BUT WILL BE AN UNBELIEVER BY THE EVENING. HE WILL SEE THE EVENING IN AS A BELIEVER BUT WILL BE AN UNBELIEVER BY THE MORNING. MANY PEOPLE WILL SELL THEIR RELIGIONS FOR A PALTRY WORLDLY GAIN." (Tirmidhi, Fitan 30, (2196).

People will live in such a time that, IN THAT TIME, HAVING FORTITUDE IN RELIGION WILL BE AS HARD AS HOLDING FIRE IN ONE’S HAND. Because in that time believers (will be exposed to such insults that they will be less esteemed than sheep or goats. MANY PEOPLE WILL BE UNABLE TO WITHSTAND THIS DEFAMATION AND PRESSURE. THE WEAK WILL SUFFER LOSSES AND SELL THE RELIGION AND SACRED MATTERS FOR A PALTRY WORLDLY GAIN. The course of day and night will bring in such an age that one will rise and ask, “who will sell his faith (and sacred matters) to us for a platry gain?” That question is not in vain. Many will sell their religions for a very small worldly possession.

Abu Umayya ash-Sha'bani relates:

"Cling to the lawful and avoid the unlawful! Whenever you see an act of  parsimony followed, an act of whim obeyed, earthly gain preferred (over religion and Hereafter), when you witness opinion holders being satisfied with their own opinions (without listening to those who went before), then look at yourself. Cease to deal with people. Because (when you reach that stage) the days of fortitude will be behind you. Those days will be troubles, like holding fire in your hands. In those days, people capable of good deeds such as yours will receive the reward of fifty people." (Abu Dawud, al-Malahim 17, (4341); Tirmidhi, Tafsir, Mâide, (3060); Ibn Majah, Fitan 21, (401)