Don’t be unwilling to say, “I do not know,” because in truth there is much we do not know. Teach principles that have consequence in salvation. Avoid judging the faith of others on the basis of our own strong personal opinions in matters that may not, in fact, significantly relate to salvation.
It is of great consequence for us to know that God created man and that he created the earth. Is it of equal importance to know the method or methods and the time involved? I do not think so. I know that God created the earth and I know why.