Then I'm guessing Psalm 91, upon which this teaching is based, doesn't sound biblical to you. And also Phillippians 4:19 says "My God shall supply all your needs according to the riches of his grace." Is that unbiblical? And how does one expect the gospel to go forth unless there's provision to help in its spread? When you look in Acts and the letters of the apostles, you find that the journeys of Paul to other provinces were made possible through the contributions of the churches, and this was all possible through the Lord's provision. It's hypocritical to think that the physical needs of people are of less importance.
Psalm 91
He that dwelleth in the secret place of the most High shall abide under the shadow of the Almighty.
I will say of the Lord, He is my refuge and my fortress: my God; in him will I trust.
Surely he shall deliver thee from the snare of the fowler, and from the noisome pestilence.
He shall cover thee with his feathers, and under his wings shalt thou trust: his truth shall be thy shield and buckler.
Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day;
Nor for the pestilence that walketh in darkness; nor for the destruction that wasteth at noonday.
A thousand shall fall at thy side, and ten thousand at thy right hand; but it shall not come nigh thee.
Only with thine eyes shalt thou behold and see the reward of the wicked.
Because thou hast made the Lord, which is my refuge, even the most High, thy habitation;
There shall no evil befall thee, neither shall any plague come nigh thy dwelling.
For he shall give his angels charge over thee, to keep thee in all thy ways.
They shall bear thee up in their hands, lest thou dash thy foot against a stone.
Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.
Because he hath set his love upon me, therefore will I deliver him: I will set him on high, because he hath known my name.
He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him.
With long life will I satisfy him, and shew him my salvation.