There are many non-Muslims who sacrifice time and wealth to render humanitarian acts.

Answer

Allah Ta'ala, answering your question says:

"Say (O Muhammad, to the kuffaar): 'Should We inform

You of the worst losers with regard to (good) deeds?'

They are those whose (good/ virtuous/humanitarian) efforts are destroyed in this worldly life while they think that they are practicing virtuous deeds."

(Al-Kahf 103 & 104)

Minus the fundamental Pivot of Imaan, deeds of virtue will have absolutely no value in the Aakhirah. Allah Ta'ala rewards in this world the kuffaar for their virtuous deeds. In the Hereafter, they have no share of success and salvation. Even Fir'oun had engaged in considerable humanitarian service. He used to feed thousands of poor daily.

Being concerned about issues beyond our control and power is futility inspired by Iblees. These kuffaar who engage in humanitarian deeds of virtue are the makhlooq (creation) of Allah Ta'ala. Whatever Allah Ta'ala will do with them in the Aakhirah is His Prerogative. Stating this Prerogative, Nabi Isaa (Alayhis salaam) responds to Allah Ta'ala as stated in the following Aayat:

"If You (O Allah!) punish them, then verily, they are Your slaves (You have the right to do with them as You will). And, if You forgive them, most certainly, You are The Mighty, The Wise.

(It is Your Prerogative to do so)."

Whatever, will happen to the kuffaar humanitarian workers and the like in the Aakhirah, is not our concern. It is the concern of Allah Azza Wa Jal Alone. Beware of the evil inspirations of Shaitaan who cunningly spreads his snare to dilute and destroy Imaan with such stupid wasaawis which breed doubts of kufr.