I believe that both the created and the creator exist.
I assume that by "the created," you mean nature. It definitively exists, however, it is logically possible that it is all that exists. Or, as you suggest, it may have been created by some process, such as emanating from a multiverse in which it began to expand billions of years ago. You choose to believe that its source was a sentient, supernatural agent, or an awakened or wakeful multiverse so-to-speak.
The more science finds out, the more evidence there is for a creator/designer.
If you mean a god, I disagree. There is nothing that we are aware that exists that requires intelligent oversight to explain, and much that doesn't, including the assembling of the universe from an initial hot, dense state and its day-to-day operation. Science has made gods less necessary as explanatory devices, and is one of the explanations for the waning of Christianity in the West, where more people are educated about it.
If you think that this universe has existed forever in some form
I think that that is one of the logical possibilities. The universe has either always existed or came into existence, and if it came into existence, it either did so either uncaused or caused by some prior existence, which might or might not be sentient, and which itself might have always existed or come into existence uncaused. I think that this list is exhaustive, meaning that if reason can be trusted, one of these must be the case. But we have no means of ruling any in or out at this time. The best we can do is order them according to Occam' parsimony principle. Adding a prior source adds complexity (an unseen reality) without extra explanatory power and requiring that prior source be conscious compounds the problem.
you should be able to believe the designer could have existed forever without a designer.
Yes, that's included in my list, under uncreated, conscious, prior source for our universe.
An extra layer of complexity means nothing unless you think that the simplest answer is always the right one.
The simplest narrative that accounts for all relevant observation is preferred. Adding more increases complexity without adding any explanatory or predictive power. What prevents you from adding more to your narrative, like our universe's conscious creator - what you call "God" - being the product of a multiverse that generates untold numbers of gods running their own universes? And let's throw in a triumvirate of gods to create the multiverse that created your god who created our universe? As you can see, we can end endless complexity to this narrative, but none of it accounts for observed reality better than narratives that omit all of that.
Somebody with a more complicated religious belief and narrative than yours can make all of the same arguments you make in support of his belief. He just believes it, and you can't prove he's wrong. Furthermore, the more science reveals, the more evidence there is for a triumvirate of gods to create the multiverse that created the god that created our universe. If you can believe in just this final god, you should be able to believe in all the rest.
your faith in empiricism and the only way.
Empiricism is the only path to knowledge.
It is a strawman to claim that the Bible has been falsified just because you think your particular interpretation has been falsified.
Parts of the Bible have been falsified. That's not controversial outside of fundamentalist religious circles. Apologists are working to try to reconcile scripture with science, but they need to reinterpret the language of scripture and call it allegory, for example, claiming that it never meant what it says wherever what it says has been falsified. The universe wasn't formed in six days, so now, a day isn't a day.
Incidentally, a myth is not an allegory or metaphor. The latter are specific literary forms which myth doesn't meet. They include substituting symbols for known people, objects, and events. Myths don't. They attempt to explain the unknown with free speculation.
you and your gang of atheist/skeptics who attack theists in a swarm
This is your religion speaking. Nobody is attacking you, and there is no gang and no swarming, which is dehumanizing language, like calling liberals vermin (it's a recent American thing and a not-so-recent German thing). You have been taught to see dissent as malevolent.
Science is about the how and religion is about the why. Science tells us nothing about the why question. Those answers come from religion, or should I say, from the revelation from the true God.
Religion has no answers, just guesses, like myths.
All science is, is a tool of humans that we can use to find out about the physical world. It has it's limitations but some people see the physical realm as the be all and end all of reality and so those limitations are less visible to them.
And some people imagine that there are realms and agents that exist that don't and are vested in those reveries. Naturally, science can't help them, which they describe as a limitation of science rather than a limitation of undisciplined thinking.