Initially, I found this website to be quite useful; they are biblically sound on many subjects. Unfortunately, while the website claims to teach salvation by grace through faith and eternal security, it promotes Lordship Salvation and condemns easy-believism. The reality is, to get saved, all one needs to do is to believe in the Lord Jesus Christ (Acts 16). Romans 10 makes it clear, "If thou shalt confess with thy mouth the Lord Jesus and believe in thine heart that God hath raised him from the dead, thou shalt be saved".
Unfortunately, this website believes that true saving faith must lead to a change in behavior, or it is not true salvation. This is one of Satan's subtle lies. In addition, the website uses a variety of different Bible versions, promotes the use of false Bibles such as the NIV, ESV, ERV, and others. They criticize and attack the King James Only position.
Thus, it leads to false doctrine such as Lordship salvation, Calvinism, God's "sovereignty", an authoritarian/tyrannical interpretation of Romans 13, and others. Not to mention they promote false teachers such as John Piper and John MacArthur. This website is 4-Point Calvinist.
I would recommend the following sites:
http://www.jesus-is-savior.com (one of my favorite teachers, David Stewart)