I don’t know if he knows the gospel, but he certainly doesn’t preach the gospel. And no man has ever been saved praying the sinner’s prayer. Many who prayed a sinner’s prayer are indeed saved, but they were saved by God’s grace, not because of their own prayers. Christians are “born not of blood, nor of the will of the flesh, nor of the will of man, but of God.” (John 1:13)
The Jesus Christ of Scriptures isn’t the weak Jesus men preach today. He’s not a begging savior who will come into your heart if you are willing. The Jesus Christ of Scripture is the King of Kings and Lord of Lords. He is ruling and reigning on His throne right now. Jesus Christ of the Bible was mighty to save to the uttermost. Those purposed to be saved in eternity past (Ephesians 1) will be saved. Every single one of them. ALL whom the Father giveth will come to Christ. (John 6:37)
If that prayer was furnished to that man at the time he was ready to give his eternal life to the Lord... yes he has, and you have told a lie.
Frankly I believe you ignore the whole issue of divine Holy Spirit timing here. You create an artificial dichotomy.
If you can find Osteen proclaiming that mouthing the prayer is all that is needed ever, then I’ll take it back. But I think even he knows it needs to be sincere, and that it won’t be sincere until the right time.