The devil would convince us that we won't have time to do the things we need to do if we take time for God. He will say ..."If you pay your tithe, you won't have the money to pay the bill coming due next week." This is a lie all the way through.
Everybody thinks that when you mention "tithe", you are talking just about your money. God wants 10% of you. He owns you anyway.
Since God has given you a free will, you can say, "No, I'm not going to give Him anything." OK, then you will reap the "blessing" of that ... which is nothing. You will get back what you give.
1 Corinthians 9:6,7 AMP.... Remember this: he who sows sparingly and grudgingly will also reap sparingly and grudgingly, and he who sows generously and that blessings may come to someone, will also reap generously and with blessings. Let each one [give] as he has made up his own mind and purposed in his heart, not reluctantly or sorrowfully or under compulsion ... for God loves (that is, He takes pleasure in, prizes above other things, and is unwilling to abandon or to do without) a cheerful (joyous, prompt-to-do-it giver)... whose heart is in his giving.
God has covered all the bases ... if we would just read His Book for what it really says, not what we think it says. Whatever argument we may come up with, God has the answer for it in His Word in the New Covenant.
Reverend Robert W. & Mary C. Butler