There exists a very real spiritual domain out there which is made knowable by God the Holy Spirit to believers via unique spiritual gifts given to the believer upon saving faith. Those who have never placed faith in God through faith in Christ do not have such a regenerated human spirit, so they will naturally percieve by means of the five senses and rationalism, appealing to science, physics, medical theory, etc., but things of the spirit will seem to be simply foolishness or misplaced trust without verifiability.
Other spiritual creatures exist such as angels, both fallen and elect. We are warned that fallen angels are under the command of the Devil, Satan, the Adversary, also described as a Malevolent Deceiver.
Each believer has a plan for him which God has predetermined regarding our logistical support. As long as we remain in fellowship with Him, we may be in the proper time and place to work according to His Will, by His plan, fulfilling good works which He has already prepared rewards and crowns for us to receive in heaven at the bema seat of Christ.
Not all of us have the same spiritual gifts, any more than we fill the same spot in His plan. We are, however, believers 24/7. The real challenge is to remain in prayer and in fellowship with Him in all things and at all times, persevering so as to be at the right time and place as He chooses to place us to fulfill His plan.
There are plenty of spiritual deceivers out there seeking to redirect our thinking or attention from Him to them or other distractions. Meanwhile there also are many elect angels also observing and performing a myriad of duties which we never identify.
Ever notice how sometimes we hit all the stop lights while traveling through multiple cities and they aren’t tied together? Or the times we are delayed by 2 minutes and by happenstance avoid the 6 car fatal pileup 30 miles away?
If events were as controlled only by men and chance, the world would be a much different place.