WHY DOES GOD GIVE MAN STRONG DELUSIONS SO HE WILL BELIEVE A LIE? WHY???
And for this cause God shall send them strong delusion, that they should believe a lie:
2 Thessalonians 2:11.
In determining truth or error on any given topic or subject, of prime importance is a sincere prayer for the guidance of the Holy Spirit and a heartfelt distrust of one's own wisdom as one studies. Without the Holy Spirit, another Spirit that does not have our best interest in mind, will be interpreting the evidence to us.
The Messiah said,
My sheep hear my voice, and I know them, and they follow me: John 10:27
The humble attitude with fear and trembling, without preconceived ideas of what is truth, is absolutely
necessary to determine truth on any given topic.
There were no other words that the Messiah repeated more than these,
Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. Matthew 7:7,8.
To begin, one must study all the evidence available, using inspired sources. On every topic there will always be one or two statements or texts that, at first, appear to contradict the majority of the statements or texts. God designed these to appear in this manner for a definite purpose.
In man's creation, God endowed him with a free will, the power of choice. He will never force man to be convinced against his will. Therefore, God never gives perfect knowledge and He always leaves room for doubt.
...because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie: That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
2 Thessalonians 2:10-12.