The "easy believerism" is to just "say this", "do that", "don't do the other", and voila'! No, easy believerism is just believe this statement and you'll go to heaven.
Similar to; If you believe there are green unicorns, I'll give you a million dollars. This is only a problem if you don't think I'll really pay up.
If, instead, I said: If you really believe in green unicorns, you'll walk into the desert without water and wait for one to give you a ride out.
As we see in scripture, believing in Jesus Christ is much more than simple intellectual assent and much more than thinking only about yourself, which is what I'm referring to as "easy believerism."
If I may give another example: putting one's fingers in his ears, closing his eyes, humming and jumping up and down all the while saying to himself "I believe" does not make it so.
Now faith is the substance of things hoped for, the evidence of things not seen. - Hebrews 11:1
The person who actually takes God seriously, who actually believes Him will behave that way, e.g. no minister who actually believes God IS would defy Him by engaging in homosexual behavior (Romans 1, etc.) And I do see an important difference between believing God IS and trusting Him.
Thou believest that there is one God; thou doest well: the devils also believe, and tremble. - James 2:9
The one who trusts God will walk into a den of hungry lions if God leads him there. You won't catch him doubting God, complaining, being fearful or worrying for he has surrendered to God's will. (Hebrews 11) Of course we don't have to deal with execution for our faith (yet) but there is other evidence whereby we can know whether we are trusting Him, i.e. following Him (Romans 8, John 15, I Cor 2, etc.):
But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law. - Galatians 5:22-23
If others do not see all of these Spiritual fruits in our lives then we are still self-serving and have more to give up.
Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. - Philippians 2:12
To God be the glory, not man, never man.