"It is a small and narrow mind that is afraid to change; it is a sign of greatness that one is prepared to admit at times that one has been mistaken, and that therefore you have had to change your position." ―David Martyn Lloyd-Jones
Regardless of what the situation or scenario is (creation, religion, church doctrine, church practice, medicine, etc.), once you learn the truth, if you were conned, if you were manipulated, if you were lied to or misled (deliberately or ignorantly) and were wrong, it is okay to change course.
You should align with the truth, if you have any integrity, character, or honour.
Once you learn the truth and that you are mistaken, once you learn that you were conned, that you were manipulated, that you were lied to or misled (deliberately or ignorantly), if you continue on with the lie, now you have become a party to it; now you are aiding and abetting that lie and the perpetrators of that lie.
“You will know the truth, and the truth will make you free.” John 8:32
Anytime you learn truth, there is a sense of being set free; free from the chains that once bound you. If something you believe to be true tugs at you, you should investigate it, and do so with prayer and great discernment. Often people exchange one lie for another lie. When I was a child being taught about the Pangaean Theory, something deep inside tugged at me; the entire concept made absolutely zero sense unless every continent was nothing more than an island floating atop the water.
A word of caution: When you discover the truth, or it is revealed to you by someone else, often you will become angry and try to defend the lie. You will want to hold on to the lie rather than admitting you were conned, manipulated, lied to or misled. Your pride is a very powerful thing. Even as you fight the truth, the information will ring true with your core being.
“All truth passes through three stages: First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.” —Arthur Schopenhauer