Why do some people have a problem with things beyond logical understanding?

You are right. There are many things beyond the scope of our perception. Whatever we are told about such thing is just a fraction of imagination of some people who claim to be religious gurus. But they do not have any convincing theories.

For example from my childhood used to imagine suppose I get some machine to travel into the infinite, where will it end and if an end comes then what will be beyond it. I still don't have answer for it.

This is why I am so vehemently opposed to your doctrine. I have dedicated my life to reducing the hold that religion has on my fellow people and like religion, I will use any means necessary to achieve my goals. The human race simply must continue to progress by gaining more knowledge and understanding of our universe. Religion inhibits this process like a dam wall inhibits the flow of a river. I admit, there must be ethics involved with the pursuit of science and technology, but ethics as defined by religion are ridiculous! And the bible as a source of knowledge..? Come off it.

Nothing can be "understood" logically. Logic is a form of thought, not it's content. The truth or falsehood of a proposition is based on the truth or falsehood of the premises used to reach it. So, since you started with an incoherent question, the rest of your rambling lost me.

i believe in saquatch, nessie, mokele mbembe, la chupacabras, and many other cryptids, and unexplainable things

but one thing, that i have found no evidence of, and that does not convince me of its existence at all

is the existence of god

Because it is human nature to fear that which is unknown.

so to say i don't know everything means i have to admit there must be a god? no thanks.