Do you actually think it’s just a mental “ascent” that Jesus is Lord? If you think that then you don’t understand what faith is. Yes, demons believe but they don’t have faith in Jesus either. They don’t love God with all their hearts.
I heard the Word and I believe God.
Rom 10:17 So then faith [cometh] by hearing, and hearing by the word of God.
My faith is now in the hope (the earnest expectation) of eternal life in Jesus Christ. I have complete faith in Jesus Christ and what He has done on the cross. I believe there’s nothing I can do to add to His work.
Hbr 11:1 Now faith is the substance of things hoped for, the evidence of things not seen.
Hbr 10:34 For ye had compassion of me in my bonds, and took joyfully the spoiling of your goods, knowing in yourselves that ye have in heaven a better and an enduring substance.
I accept this free gift by faith.
Eph 2:8 For by grace are ye saved through faith; and that not of yourselves: [it is] the gift of God:
Hbr 11:6 But without faith [it is] impossible to please [him]: for he that cometh to God must believe that he is, and [that] he is a rewarder of them that diligently seek him.
As a faithful and obedient follower, I love, I preach the Gospel, I help the needy, I study the Word of God, this is not exhaustive but you get the picture.