I doubt you would believe what i said I believed concerning the definition of believe is.
However, I think, as a matter of discourse in the English language, we can agree that words mean things, and that there a standard definitions to words that we all should accept, or we play semantics instead of debating doctrine. So, I will go with Websters definition:
to accept or regard (something) as true
Thus, I regard it as true, factual, and veracious that Jesus Christ lived a sinless life, was crucified for our sins, was dead and buried, and physically raised by God to life on the 3rd day. Furthermore, I freely confess Jesus is LORD. (all caps intentional).
Furthermore, I fully accept Jesus' words that my belief ALONE is sufficient for my salvation.
John 3:14-16 " 14 Just as Moses lifted up the snake in the wilderness, so the Son of Man must be lifted up, 15 that everyone who believes may have eternal life in him.” 16 For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
Even the demons believe... and they tremble in terror (James 2:19).
Furthermore, I freely confess Jesus is LORD.
Yet, not everyone who says to Christ, "Lord, Lord" will enter the Kingdom of God (Matt 7:21). Rather, only those who DO the will of God the Father.
Protestants decry the DOING part of salvation but it is essential. It's not that we are earning our salvation but that we are preparing for it. Believe is an action word. Your description is passive. If I believe that hard work will pay off in my business, that is good. It's even better if I roll up my sleeves and actually DO the hard work. If you believe in Christ as Lord, then you will do all that He has commanded. He commanded us to be baptized (Matt 28:19), confess our sins (John 20 & Acts 19:18), eat His flesh (John 6:56), fast, pray and give alms (Matt 6).
I offer this previous post for more of a discussion on the "work" we are called to. It's getting late and I should be going to bed soon.