Should a Christian tithe, what does the Bible say

Yes
So there are obvious questions:

What commands does the Bible record God giving to Abraham?
What commands does the Bible record Christ giving to us?

The example of physical circumcision - commanded to Abraham, not commanded to Christians - makes it obvious that we cannot assume every place we see the word commandments it is always talking about the same thing. Or sacrifices commanded to the children of Israel, this is not the Law we are given, so obviously just because we read 'commandments' we can't jump to the conclusion that it means for example everything in the Torah. For example tithe. Never recorded as commanded to Abraham, never commanded to Christians.

What commands did Jesus give to the church, when was He talking to Israel under the Law and when does He speak to those under His new covenant? We have to ask these questions and we have to seek out the true answers.

Here's a list describing Abraham's obedience. No mention of the law of Moses, however.

He:

• left Ur of the Chaldees upon GOD's order
• left Haran upon GOD's order
• believed GOD's promise
• sojourned as a stranger in the land of Canaan upon GOD's order
• circumcised himself and his house as commanded by GOD
• offered Isaac as commanded by GOD

¯\_(ツ)_/¯

Here's a list describing Abraham's obedience. No mention of the law of Moses, however.

He:

• left Ur of the Chaldees upon GOD's order
• left Haran upon GOD's order
• believed GOD's promise
• sojourned as a stranger in the land of Canaan upon GOD's order
• circumcised himself and his house as commanded by GOD
• offered Isaac as commanded by GOD

¯\_(ツ)_/¯

I recently heard a sermon on tithing at a Reformed Baptist Church, where I have applied for membership.
The pastor made it clear that we are all to tithe because that's what God wants us to do. He said, if we don't give generously of our finances that God will not bless us.
He presented many Bible verses showing that it is Biblical and that God expects us to obey it.
We can't claim to be believers, then only pick and choose the parts of the Bible that suit our lifestyle and ignore the parts we don't like.
Below is a link listing 20 Bible verses showing that tithing is something all of Gods people must do if we are to be obedient to His Word

https://echurch.com/20-bible-verses-about-tithing/

I know that nobody will argue with Gods Word, so this is only a reminder of our obligation to tithe. I will say in advance that anyone who tries to argue against it is arguing against sound Biblical teaching

What that means is Christians are not under the condemnation or penalty of the Law if they have repented, been baptized and received the Holy Spirit.

Act 2:38 Then Peter said to them, "Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit.

Christ plainly says this...

Mat 19:17 So He said to him, "Why do you call Me good? No one is good but One, that is, God. But if you want to enter into life, keep the commandments."

Saints (Christians) are described thusly...

Rev 14:12 Here is the patience of the saints; here are those who keep the commandments of God and the faith of Jesus.

John tells us this...

Rev 22:14 Blessed are those who do His commandments, that they may have the right to the tree of life, and may enter through the gates into the city.

Some writings of Paul...

Rom 2:13 (for not the hearers of the law are just in the sight of God, but the doers of the law will be justified;

Rom 7:1 Or do you not know, brethren (for I speak to those who know the law), that the law has dominion over a man as long as he lives?

The Law describes sin...

1Jn 3:4 Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.

Rom 7:7 What shall we say then? Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, "YOU SHALL NOT COVET."

The Law is not the problem...

Rom 7:14 For we know that the law is spiritual: but I am carnal, sold under sin.

Last half of the verse shows us the problem. We have met the enemy and he is us.

Paul understood this....

Rom 7:25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin

He intended to keep the Law but still stumbled and sinned because he was still human. He understood that conversion was a process and that we are not perfect at conversion. It is a lifelong process...

Rom 8:7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.

We spend our life rooting out sin and becoming more converted...

2Pe 3:18 but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory both now and forever. Amen.

How did Paul feel about the Commandments?

1Co 7:19 Circumcision is nothing and uncircumcision is nothing, but keeping the commandments of God is what matters.

What Commandments have we from the beginning?

2Jn 1:5 And now I plead with you, lady, not as though I wrote a new commandment to you, but that which we have had from the beginning: that we love one another.
2Jn 1:6 This is love, that we walk according to His commandments. This is the commandment, that as you have heard from the beginning, you should walk in it.

Here is an interesting assignment for you to study, find all ten of the Ten Commandments either stated or in practice beginning at Gen 1:1 and ending at Ex 19:25. It makes for a very interesting study. I'll help you out with two of them.

#4 - Ex 16:4-5, 21-30

#7 - Gen 20

What that means is Christians are not under the condemnation or penalty of the Law if they have repented, been baptized and received the Holy Spirit.

Since you're fairly new around here, I don't know whether you mean to refute what I wrote or simply expand on it. I'll give you the benefit of the doubt. However, I would ask, what other kind of Christian, in your view, is there besides the one described in bold?

love one another is not among the 10

Many of the Ten Commandments are actually teaching us how to love one another and what that looks like.