Order and organization.
The Universe including the world around us is full of almost perfectly arranged systems which are complex and organized. This indicates clearly, to me, that there was a design behind what we observe. This implies a Designer who has a reason for His creation.
Science assumes that there is order in the observable Universe and that it can be discovered by considering what is observable.
Some of the answers to our questions do not seem to have obvious answers, but we press on assuming that there is an answer even if we do not know it yet. Living things seem to operate under a different set of rules than we find with the rest of the physical Universe. Living things are subject to entropy - resulting finally with death. However, during their lives there is a force at work in each living entity which causes it to tend to overcome degeneration - healing, modification, and adaptation.
Our assumptions and biases cloud our objectivity and tend to keep us seeing the world as we have already come to see it. We should try to step outside of our own world view to consider the views of those who see things differently.
One example is to try and look at a single cell organism with fresh eyes. Consider the amazingly complex amount of information in that cell`s DNA. Does this highly organized structure lead us to understand that there was a Creator with a plan? To me it is obvious that so many billions of atoms did not end up perfectly arranged without a designer and a purposful design.