Believing in God is not only believing by words, believing in God and the mercy you received in and true Jesus Christ, is more than words alone! Do people see that you are a believer in Christ? Do they see that in the things you do? In the book of James we can read about the works that come with believing, James is saying how important it is to have works of faith!
14 What doth it profit, my brethren, if a man say he hath faith, but have not works? can that faith save him? 15 If a brother or sister be naked and in lack of daily food, 16 and one of you say unto them, Go in peace, be ye warmed and filled; and yet ye give them not the things needful to the body; what doth it profit? 17 Even so faith, if it have not works, is dead in itself. 18 Yea, a man will say, Thou hast faith, and I have works: show me thy faith apart from [thy] works, and I by my works will show thee [my] faith. 19 Thou believest that God is one; thou doest well: the demons also believe, and shudder. 20 But wilt thou know, O vain man, that faith apart from works is barren? 21 Was not Abraham our father justified by works, in that he offered up Isaac his son upon the altar? 22 Thou seest that faith wrought with his works, and by works was faith made perfect; 23 and the scripture was fulfilled which saith, And Abraham believed God, and it was reckoned unto him for righteousness; and he was called the friend of God. 24 Ye see that by works a man is justified, and not only by faith. 25 And in like manner was not also Rahab the harlot justified by works, in that she received the messengers, and sent them out another way? 26 For as the body apart from the spirit is dead, even so faith apart from works is dead.
Couple related bible verses:
26 And every one that heareth these words of mine, and doeth them not, shall be likened unto a foolish man, who built his house upon the sand:
23 For if any one is a hearer of the word and not a doer, he is like unto a man beholding his natural face in a mirror:
11 And he answered and said unto them, He that hath two coats, let him impart to him that hath none; and he that hath food, let him do likewise.
1 John 3:17
17 But whoso hath the world's goods, and beholdeth his brother in need, and shutteth up his compassion from him, how doth the love of God abide in him?
24 saying, What have we to do with thee, Jesus thou Nazarene? art thou come to destroy us? I know thee who thou art, the Holy One of God.
10 And Abraham stretched forth his hand, and took the knife to slay his son.
6 And he believed in the LORD; and he counted it to him for righteousness.
3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
6 Even as Abraham believed God, and it was accounted to him for righteousness.
1 And Joshua the son of Nun sent out of Shittim two men to spy secretly, saying, Go view the land, even Jericho. And they went, and came into an harlot's house, named Rahab, and lodged there.
23 And the young men that were spies went in, and brought out Rahab, and her father, and her mother, and her brethren, and all that she had; and they brought out all her kindred, and left them without the camp of Israel.
31 By faith the harlot Rahab perished not with them that believed not, when she had received the spies with peace.
Used american standard version 1901 and King James 1611