Why do scientists teach against the existence of God when they know that everything in the universe must logically have been created by some...

The brief answer here is that this question is based on false premises.  The question assumes two conditions which are not (or are not necessarily) true.  Therefore, there is no way to answer the question as it is currently stated.

First, the question assumes that all scientists (or most scientists) “teach against the existence of God.”  This is not necessarily true.  Not all scientists actively argue that there is no God.  The question of whether...

The brief answer here is that this question is based on false premises.  The question assumes two conditions which are not (or are not necessarily) true.  Therefore, there is no way to answer the question as it is currently stated.

First, the question assumes that all scientists (or most scientists) “teach against the existence of God.”  This is not necessarily true.  Not all scientists actively argue that there is no God.  The question of whether God exists is simply not one that science can answer.  We do not have any direct evidence that can prove (through the scientific method) the existence of God.  Therefore, science cannot answer the question of whether God exists.  It is true that some scientists, like Richard Dawkins, are staunch atheists who teach that God does not exist.  However, most scientists know that the existence of God is something that they cannot prove or disprove, so they do not teach on that subject.

The second, and more important, assumption here is that scientists know that some “intelligent designer” must logically have created everything in the universe.  This is something most scientists do not believe at all.  It is true that some scientists do believe in intelligent design, but they constitute a very small minority of scientists as a whole.  Scientists as a group believe that intelligent design arguments are full of holes.  They believe that these arguments are unscientific in that parts of them cannot be proven or disproven.  In addition, they argue that there is no evidence to support those parts of intelligent design theory that could be falsified.  For these reasons, the vast majority of scientists reject the idea of intelligent design.

From this, we can see that this question cannot be answered as it is written.  The question is based on two assumptions and both of those assumptions are false.  A question that is based on false premises has no true answer.